Water Temperature of Delaware Bay in Greenwich, NJ

Current Water Temperature

70.2°F

Measurement Time: Thursday, October 9, 2025, 12:06 PM EDT

Today's Tides

Low: October 9, 6:08 AM, -0.03 ft
 High: October 9, 12:01 PM, 7.21 ft
Low: October 9, 6:54 PM, 0.04 ft

Temperature Locations

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Local Points of Interest

Ship John Shoal Lighthouse; Bombay Hook National Wildlife Refuge; Bridgeton, NJ; Sea Breeze, NJ; Smyrna, DE; Dover, DE

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Delaware Bay

Station Name: Ship John Shoal
Data Source: NOAA Tides and Currents

Elevation Above Sea Level: 0 feet / 0 meters

Sensor Depth: -2.2 feet / -0.7 meters

Nearest Address:
Ship John Shoal Lighthouse
Greenwich, NJ 08323
Cumberland County

GPS Coordinates: 39.30500, -75.37500

Nearby Water Temperatures

St. Jones River, Dover, DE (12.4 mi)
Appoquinimink River, Odessa, DE (16.9 mi)
Delaware River, Middletown, DE (17.0 mi)
Silver Lake Tributary, Townsend, DE (19.9 mi)
Chesapeake & Delaware Canal, Port Penn, DE (20.4 mi)
Murderkill River, Frederica, DE (20.8 mi)
Chesapeake and Delaware Canal, Delaware City, DE (21.6 mi)
Delaware River, New Castle, DE (27.7 mi)
Chesapeake & Delaware Canal, Chesapeake City, MD (27.8 mi)
Beaverdam Branch, Houston, DE (28.6 mi)
Christina River, Newark, DE (29.7 mi)
Christina River, Newport, DE (30.7 mi)
Christina River, Wilmington, DE (31.1 mi)
White Clay Creek, Stanton, DE (31.2 mi)
White Clay Creek, Newark, DE (31.6 mi)

Weather for Greenwich, New Jersey

Current Weather

60.1°F
Sunny
Conditions: Sunny
Humidity: 53%
Feels Like: 60.1°F
Wind: NNE 10.1 mph
Wind Gusts: 11.6 mph
Pressure: 30.42 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 4.3

Five Day Weather Forecast

Sunny
Thu
H: 68°F
L: 49°F
Partly Cloudy
Fri
H: 60°F
L: 43°F
Moderate rain
Sat
H: 67°F
L: 49°F
Heavy rain
Sun
H: 63°F
L: 58°F
Heavy rain
Mon
H: 65°F
L: 55°F

Air Quality

AQI: 1 - Good
PM2.5: 4.35 μg/m3
PM10: 4.35 μg/m3
Carbon Monoxide: 146.85 μg/m3
Nitrogen Dioxide: 5.05 μg/m3
Sulphur Dioxide: 4.25 μg/m3
Ozone: 82 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:48 AM
Sunset: 6:31 PM
Daylight: 11 hrs 26 mins
Moonrise: 7:53 PM
Moon Transit: 2:37 AM
Moonset: 10:13 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
4:38 PM - 7:08 PM

Minor Periods

7:23 PM - 8:53 PM
9:43 AM - 11:13 AM

Action Rating: 2 out of 5

Coastal Flood Advisory issued October 9 at 5:14AM EDT until October 10 at 3:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Cumberland. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Interests along Delaware Bay and its tidal tributaries should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Watch issued October 9 at 5:14AM EDT until October 13 at 8:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Cumberland. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Interests along Delaware Bay and its tidal tributaries should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Watch issued October 9 at 5:14AM EDT until October 13 at 9:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...One to two feet of inundation above ground level possible in low-lying areas near shorelines and tidal waterways. * WHERE...In Delaware, New Castle. In New Jersey, Salem. * WHEN...From Sunday afternoon through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs along tidal waterways. Some roads become impassable. Minor damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate coastal flood impacts are possible. Interests along Delaware Bay and its tidal tributaries should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Advisory issued October 9 at 5:14AM EDT until October 10 at 3:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Kent. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Interests along Delaware Bay and its tidal tributaries should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Watch issued October 9 at 5:14AM EDT until October 13 at 8:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Kent. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Interests along Delaware Bay and its tidal tributaries should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Advisory issued October 9 at 5:14AM EDT until October 10 at 3:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Atlantic, Cape May, Atlantic Coastal Cape May and Coastal Atlantic. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Significant beach erosion is possible. Interests along the Atlantic coast, back bays, and tidal waterways should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Watch issued October 9 at 5:14AM EDT until October 13 at 8:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Atlantic, Cape May, Atlantic Coastal Cape May and Coastal Atlantic. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT Friday. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Significant beach erosion is possible. Interests along the Atlantic coast, back bays, and tidal waterways should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Advisory issued October 9 at 5:14AM EDT until October 9 at 3:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Ocean, Coastal Ocean and Southeastern Burlington. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT this afternoon. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Significant beach erosion is possible. Interests along the Atlantic coast, back bays, and tidal waterways should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.


Coastal Flood Watch issued October 9 at 5:14AM EDT until October 13 at 8:00PM EDT by NWS Mount Holly NJ

Effective: Thu October 9, 2025, 5:14 AM
Expires: Thu October 9, 2025, 7:00 PM

* WHAT...For the Coastal Flood Advisory, up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways. For the Coastal Flood Watch, one to two feet of inundation above ground level possible in low- lying areas near shorelines and tidal waterways. * WHERE...Ocean, Coastal Ocean and Southeastern Burlington. * WHEN...For the Coastal Flood Advisory, until 3 PM EDT this afternoon. For the Coastal Flood Watch, from Sunday morning through Monday evening. * IMPACTS...At this level, widespread roadway flooding occurs in coastal and bayside communities and along inland tidal waterways. Many roads become impassable. Some damage to vulnerable structures may begin to occur. * ADDITIONAL DETAILS...A strong coastal storm will impact the region Sunday through Monday. Moderate to potentially major coastal flood impacts are possible. Significant beach erosion is possible. Interests along the Atlantic coast, back bays, and tidal waterways should remain alert for forecast updates regarding this potentially significant coastal flood event.

A Coastal Flood Watch means that conditions favorable for flooding are expected to develop. Be prepared to begin taking appropriate action to protect life and property. Follow the recommendations of local emergency management officials. Be sure to check the latest forecast from time to time in case a warning is issued or any new information becomes available. Visit the National Water Prediction Service at https://water.noaa.gov/wfo/phi for additional water level and flood impact information for your local tide gauge.
Thursday, October 9, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 56.3°F
Average Humidity: 52%
Chance of Rain: 0%
Wind: 14.1 mph
UV Index: 1.1

Air Quality

AQI: 1 - Good
PM2.5: 5.5 μg/m3
PM10: 5.53 μg/m3
Carbon Monoxide: 156.61 μg/m3
Nitrogen Dioxide: 9.72 μg/m3
Sulphur Dioxide: 3.82 μg/m3
Ozone: 63.68 μg/m3

Astronomical

Sunrise: 7:06 AM
Sun Transit: 12:48 AM
Sunset: 6:31 PM
Daylight: 11 hrs 26 mins
Moonrise: 7:53 PM
Moon Transit: 2:37 AM
Moonset: 10:13 AM
Moon Phase: Waning Gibbous
Moon Illumination: 90.1%

Best Times for Fishing or Hunting

Major Periods

2:07 AM - 4:37 AM
4:38 PM - 7:08 PM

Minor Periods

7:23 PM - 8:53 PM
9:43 AM - 11:13 AM

Action Rating: 2 out of 5

Friday, October 10, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 52°F
Average Humidity: 66%
Chance of Rain: 0%
Wind: 10.7 mph
UV Index: 1

Air Quality

AQI: 1 - Good
PM2.5: 9 μg/m3
PM10: 9.97 μg/m3
Carbon Monoxide: 176.45 μg/m3
Nitrogen Dioxide: 20.89 μg/m3
Sulphur Dioxide: 4.69 μg/m3
Ozone: 50.56 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:48 AM
Sunset: 6:30 PM
Daylight: 11 hrs 23 mins
Moonrise: 8:42 PM
Moon Transit: 3:37 AM
Moonset: 11:32 AM
Moon Phase: Waning Gibbous
Moon Illumination: 82.3%

Best Times for Fishing or Hunting

Major Periods

3:07 AM - 5:37 AM
5:41 PM - 8:11 PM

Minor Periods

8:12 PM - 9:42 PM
11:02 AM - 12:32 AM

Action Rating: 2 out of 5

Saturday, October 11, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 58.4°F
Average Humidity: 87%
Chance of Rain: 87%
Wind: 15.4 mph
UV Index: 0.5

Air Quality

AQI: 1 - Good
PM2.5: 7.43 μg/m3
PM10: 9.54 μg/m3
Carbon Monoxide: 180.69 μg/m3
Nitrogen Dioxide: 11.8 μg/m3
Sulphur Dioxide: 2.41 μg/m3
Ozone: 60.72 μg/m3

Astronomical

Sunrise: 7:07 AM
Sun Transit: 12:48 AM
Sunset: 6:28 PM
Daylight: 11 hrs 21 mins
Moonrise: 9:39 PM
Moon Transit: 4:41 AM
Moonset: 12:46 AM
Moon Phase: Waning Gibbous
Moon Illumination: 72.9%

Best Times for Fishing or Hunting

Major Periods

4:11 AM - 6:41 AM
6:45 PM - 9:15 PM

Minor Periods

9:09 PM - 10:39 PM
12:16 AM - 1:46 PM

Action Rating: 4 out of 5

Sunday, October 12, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 61.4°F
Average Humidity: 89%
Chance of Rain: 72%
Wind: 26.2 mph
UV Index: 0.1

Air Quality

AQI: 1 - Good
PM2.5: 4.84 μg/m3
PM10: 6.29 μg/m3
Carbon Monoxide: 151.53 μg/m3
Nitrogen Dioxide: 6.45 μg/m3
Sulphur Dioxide: 2.37 μg/m3
Ozone: 73.64 μg/m3

Astronomical

Sunrise: 7:08 AM
Sun Transit: 12:47 AM
Sunset: 6:27 PM
Daylight: 11 hrs 18 mins
Moonrise: 10:46 PM
Moon Transit: 5:44 AM
Moonset: 1:48 PM
Moon Phase: Waning Gibbous
Moon Illumination: 62.3%

Best Times for Fishing or Hunting

Major Periods

5:14 AM - 7:44 AM
7:48 PM - 10:18 PM

Minor Periods

10:16 PM - 11:46 PM
1:18 PM - 2:48 PM

Action Rating: 2 out of 5

Monday, October 13, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 61.6°F
Average Humidity: 95%
Chance of Rain: 88%
Wind: 22.6 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 3.52 μg/m3
PM10: 3.68 μg/m3
Carbon Monoxide: 151.85 μg/m3
Nitrogen Dioxide: 9.4 μg/m3
Sulphur Dioxide: 3.45 μg/m3
Ozone: 80 μg/m3

Astronomical

Sunrise: 7:09 AM
Sun Transit: 12:47 AM
Sunset: 6:25 PM
Daylight: 11 hrs 16 mins
Moonrise: 11:57 PM
Moon Transit: 6:46 AM
Moonset: 2:39 PM
Moon Phase: Last Quarter
Moon Illumination: 51.1%

Best Times for Fishing or Hunting

Major Periods

6:16 AM - 8:46 AM
8:46 PM - 11:16 PM

Minor Periods

12:00 AM - 12:00 AM
2:09 PM - 3:39 PM

Action Rating: 2 out of 5

The times presented here are based upon the solunar theory, which is the idea that the movements of fish and other animals are affected by the location of the sun and moon. The major periods are believed to be the times of the greatest animal activity and occur when the moon is directly overhead or underfoot (lunar transits). The minor periods also see increased activity and occur when the moon is rising or setting. The strongest activity occurs during full or new moons, and the weakest during quarter or three quarter moons. This is indicated by the Action Rating.

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