Water Temperature of the Delaware River in New Castle, DE

Current Water Temperature

66.0°F

Measurement Time: Monday, May 18, 2026, 9:09 PM EDT

Temperature Locations

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Local Points of Interest

Delaware Memorial Bridge; Wilmington, DE; Pennsville Township, NJ

Delaware River

Station Name: DELAWARE RIVER AT DEL MEM BRIDGE AT WILMINGTON DE
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
I-295
New Castle, DE 19720
New Castle County

GPS Coordinates: 39.68927997, -75.521588

Nearby Water Temperatures

Christina River, Wilmington, DE (3.4 mi)
Christina River, Newport, DE (4.9 mi)
Brandywine Creek, Wilmington, DE (6.3 mi)
White Clay Creek, Stanton, DE (6.7 mi)
Red Clay Creek, Wooddale, DE (7.9 mi)
White Clay Creek, Newark, DE (8.2 mi)
Pike Creek, Newark, DE (9.3 mi)
Chesapeake & Delaware Canal, Port Penn, DE (9.4 mi)
Delaware River, Marcus Hook, PA (10.3 mi)
Chesapeake and Delaware Canal, Delaware City, DE (10.7 mi)
Christina River, Newark, DE (11.5 mi)
White Clay Creek, Newark, DE (12.1 mi)
Brandywine Creek, Chadds Ford, PA (13 mi)
Delaware River, Middletown, DE (13.2 mi)
White Clay Creek, Landenberg, PA (13.8 mi)

Weather for New Castle, Delaware

Current Weather

73.9°F
Clear
Clear
77.3°F
77°F
71%
S 5.1 mph
10.6 mph
72.9°F
61.3°F
0 in
0%
9 mi
1021 mbar
0

Five Day Weather Forecast

Sunny
Tue
H: 96°F
L: 68°F
Moderate rain
Wed
H: 92°F
L: 66°F
Moderate rain
Thu
H: 59°F
L: 52°F
Moderate rain
Fri
H: 54°F
L: 50°F
Heavy rain
Sat
H: 51°F
L: 49°F

Air Quality

PM2.5: 8.15 μg/m3
PM10: 9.65 μg/m3
Carbon Monoxide: 156.85 μg/m3
Nitrogen Dioxide: 7.35 μg/m3
Sulphur Dioxide: 1.85 μg/m3
Ozone: 71 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:58 AM
Sunset: 8:14 PM
Daylight: 14 hrs 30 mins
Moonrise: 8:00 AM
Moon Transit: 4:02 PM
Moonset: 12:02 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

5:01 AM - 7:31 AM
3:32 PM - 6:02 PM

Minor Periods

7:30 AM - 9:00 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Heat Advisory issued May 18 at 2:10PM EDT until May 20 at 8:00PM EDT by NWS Mount Holly NJ

Effective: Mon May 18, 2026, 2:10 PM
Expires: Tue May 19, 2026, 5:00 AM

* WHAT...Heat index values up to 98. * WHERE...In Delaware, New Castle County. In Pennsylvania, Eastern Chester County. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Record setting high temperatures are quite possible through Wednesday, with maximum heat indices nearing 100 degrees during peak heating each afternoon. Given the intensity of this early season stretch of heat and humidity, we are not acclimated to it yet and therefore impacts could be greater if precautions are not taken. Showers and some thunderstorms arrive later Wednesday afternoon and evening which will break this early season heat.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.


Air Quality Alert issued May 18 at 3:45PM EDT by NWS Mount Holly NJ

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 3:45 PM
Expires: Wed May 20, 2026, 12:00 AM

The Delaware Department of Natural Resources and Environmental Control has issued a code orange air quality alert Tuesday for New Castle County. A code orange air quality alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children...people suffering from asthma... heart disease or other lung diseases...and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles...visit http://www.dnrec.delaware.gov


Air Quality Alert issued May 18 at 9:58AM EDT by NWS Mount Holly NJ

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 9:58 AM
Expires: Tue May 19, 2026, 10:00 AM

The New Jersey Department of Environmental Protection has issued a Code Orange Air Quality Action Day for Ground Level Ozone, from 11 AM to 11 PM EDT Tuesday. An Air Quality Advisory means that air quality within the region may approach or exceed unhealthy standards. For more information on current and forecast concentrations of ground-level ozone and fine particulates, visit www.airnow.gov or www.state.nj.us/dep/airmon/ or call the New Jersey Bureau of Air Monitoring at 609-292-0138


Air Quality Alert issued May 18 at 3:45PM EDT by NWS Mount Holly NJ

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 3:45 PM
Expires: Wed May 20, 2026, 12:00 AM

The New Jersey Department of Environmental Protection has issued a code orange air quality alert Tuesday for Salem and Cumberland Counties. A code orange air quality alert means that air pollution concentrations within the region may become unhealthy for sensitive groups. Sensitive groups include children...people suffering from asthma... heart disease or other lung diseases...and the elderly. The effects of air pollution can be minimized by avoiding strenuous activity or exercise outdoors. For more information on ground-level ozone and fine particles...visit http://www.state.nj.us/dep/


Air Quality Alert issued May 18 at 8:06AM EDT by NWS Mount Holly NJ

Non-Weather Emergency Message. Not sent to IPAWS.

Effective: Mon May 18, 2026, 8:06 AM
Expires: Tue May 19, 2026, 12:00 AM

The Pennsylvania Department of Environmental Protection has issued a Code Orange Air Quality Action Day for Ground Level Ozone, until midnight EDT tonight. An Air Quality Action Day means that air quality within the region may approach or exceed unhealthy standards. For more information on current and forecast concentrations of ground-level ozone and fine particulates, visit www.airnow.gov or www.aqpartners.state.pa.us


Tuesday, May 19, 2026

Weather Forecast

Sunny
95.7°F
68.4°F
80.5°F
61%
0 in
0%
0%
13.2 mph
9


Air Quality

AQI: 1 - Good
PM2.5: 8.58 μg/m3
PM10: 10.34 μg/m3
Carbon Monoxide: 156.77 μg/m3
Nitrogen Dioxide: 4.87 μg/m3
Sulphur Dioxide: 1.97 μg/m3
Ozone: 112.6 μg/m3

Astronomical

Sunrise: 5:44 AM
Sun Transit: 12:58 AM
Sunset: 8:14 PM
Daylight: 14 hrs 30 mins
Moonrise: 8:00 AM
Moon Transit: 4:02 PM
Moonset: 12:02 AM
Moon Phase: Waxing Crescent
Moon Illumination: 7.4%

Best Times for Fishing or Hunting

Major Periods

5:01 AM - 7:31 AM
3:32 PM - 6:02 PM

Minor Periods

7:30 AM - 9:00 AM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Wednesday, May 20, 2026

Weather Forecast

Moderate rain
91.7°F
66.1°F
77.5°F
67%
0.36 in
82%
0%
18.1 mph
9.3


Air Quality

AQI: 1 - Good
PM2.5: 7.28 μg/m3
PM10: 8.58 μg/m3
Carbon Monoxide: 155.89 μg/m3
Nitrogen Dioxide: 5.61 μg/m3
Sulphur Dioxide: 1.91 μg/m3
Ozone: 103.6 μg/m3

Astronomical

Sunrise: 5:43 AM
Sun Transit: 12:58 AM
Sunset: 8:15 PM
Daylight: 14 hrs 31 mins
Moonrise: 9:15 AM
Moon Transit: 5:04 PM
Moonset: 12:58 AM
Moon Phase: Waxing Crescent
Moon Illumination: 14.4%

Best Times for Fishing or Hunting

Major Periods

6:05 AM - 8:35 AM
4:34 PM - 7:04 PM

Minor Periods

8:45 AM - 10:15 AM
12:00 AM - 12:00 AM

Action Rating: 3 out of 5

Thursday, May 21, 2026

Weather Forecast

Moderate rain
59°F
52.1°F
56.3°F
76%
0.56 in
76%
0%
10.3 mph
1


Air Quality

AQI: 1 - Good
PM2.5: 5.76 μg/m3
PM10: 5.97 μg/m3
Carbon Monoxide: 169.72 μg/m3
Nitrogen Dioxide: 8.42 μg/m3
Sulphur Dioxide: 2.61 μg/m3
Ozone: 62.96 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:58 AM
Sunset: 8:16 PM
Daylight: 14 hrs 33 mins
Moonrise: 10:32 AM
Moon Transit: 6:01 PM
Moonset: 12:43 AM
Moon Phase: Waxing Crescent
Moon Illumination: 23.2%

Best Times for Fishing or Hunting

Major Periods

7:03 AM - 9:33 AM
5:31 PM - 8:01 PM

Minor Periods

10:02 AM - 11:32 AM
12:13 AM - 1:43 AM

Action Rating: 3 out of 5

Friday, May 22, 2026

Weather Forecast

Moderate rain
53.8°F
49.8°F
52°F
93%
0.52 in
71%
0%
7.8 mph
3


Air Quality

AQI: 1 - Good
PM2.5: 8.83 μg/m3
PM10: 10.4 μg/m3
Carbon Monoxide: 187.16 μg/m3
Nitrogen Dioxide: 12.23 μg/m3
Sulphur Dioxide: 1.74 μg/m3
Ozone: 49.69 μg/m3

Astronomical

Sunrise: 5:42 AM
Sun Transit: 12:58 AM
Sunset: 8:16 PM
Daylight: 14 hrs 35 mins
Moonrise: 11:45 AM
Moon Transit: 6:51 PM
Moonset: 1:17 AM
Moon Phase: Waxing Crescent
Moon Illumination: 33.4%

Best Times for Fishing or Hunting

Major Periods

7:56 AM - 10:26 AM
6:21 PM - 8:51 PM

Minor Periods

11:15 AM - 12:45 AM
12:47 AM - 2:17 AM

Action Rating: 2 out of 5

Saturday, May 23, 2026

Weather Forecast

Heavy rain
51.1°F
49.1°F
50.2°F
97%
1.12 in
63%
0%
10.5 mph
3


Air Quality

AQI: 0 -
PM2.5: 0 μg/m3
PM10: 0 μg/m3
Carbon Monoxide: 0 μg/m3
Nitrogen Dioxide: 0 μg/m3
Sulphur Dioxide: 0 μg/m3
Ozone: 0 μg/m3

Astronomical

Sunrise: 5:41 AM
Sun Transit: 12:58 AM
Sunset: 8:17 PM
Daylight: 14 hrs 36 mins
Moonrise: 12:55 AM
Moon Transit: 7:38 PM
Moonset: 1:45 AM
Moon Phase: First Quarter
Moon Illumination: 44.4%

Best Times for Fishing or Hunting

Major Periods

8:45 AM - 11:15 AM
7:08 PM - 9:38 PM

Minor Periods

12:25 AM - 1:55 PM
1:15 AM - 2:45 AM

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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