Water Temperature of the St. Johns River in Jacksonville, FL

Current Water Temperature

87.8°F

Measurement Time: Thursday, August 14, 2025, 8:30 PM EDT

Temperature Locations

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Local Points of Interest

Riverfront Park; Marco Lake

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St. Johns River

Station Name: ST JOHNS RIVER BL MARCO LK AT JACKSONVILLE, FL
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet / 0 meters

Nearest Address:
1799 River Rd
Jacksonville, FL 32207
Duval County

GPS Coordinates: 30.30478056, -81.6601

Nearby Water Temperatures

St. Johns River, Jacksonville, FL (1.3 mi)
St. Johns River, Jacksonville, FL (3.7 mi)
St. Johns River, Jacksonville, FL (4.5 mi)
Cedar River, Jacksonville, FL (5.0 mi)
Pottsburg Creek, Jacksonville, FL (5.5 mi)
St. Johns River, Jacksonville, FL (7.9 mi)
St. Johns River, Jacksonville, FL (8.3 mi)
St. Johns River, Jacksonville, FL (8.3 mi)
Ortega River, Jacksonville, FL (8.3 mi)
St. Johns River, Orange Park, FL (8.7 mi)
Broward River, Jacksonville, FL (9.6 mi)
Trout River, Jacksonville, FL (10.8 mi)
Dunn Creek, Jacksonville, FL (11.0 mi)
Julington Creek, Jacksonville, FL (12.4 mi)
Clapboard Creek, Jacksonville, FL (12.9 mi)

Weather for Jacksonville, Florida

Current Weather

84°F
Clear
Conditions: Clear
Humidity: 77%
Feels Like: 90.1°F
Wind: WSW 4.9 mph
Wind Gusts: 7.6 mph
Pressure: 30.06 in
Precipitation: 0 in
Cloud Cover: 0%
Visibility: 9 mi
UV Index: 0

Five Day Weather Forecast

Sunny
Fri
H: 100°F
L: 81°F
Partly Cloudy
Sat
H: 100°F
L: 83°F
Partly Cloudy
Sun
H: 95°F
L: 81°F
Sunny
Mon
H: 94°F
L: 78°F
Sunny
Tue
H: 93°F
L: 78°F

Air Quality

PM2.5: 10.73 μg/m3
PM10: 12.4 μg/m3
Carbon Monoxide: 257.15 μg/m3
Nitrogen Dioxide: 14.62 μg/m3
Sulphur Dioxide: 3.52 μg/m3
Ozone: 36 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 1:31 PM
Sunset: 8:08 PM
Daylight: 13 hrs 14 mins
Moonrise: 12:26 AM
Moon Transit: 6:25 AM
Moonset: 1:32 PM
Moon Phase: Last Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

5:55 AM - 8:25 AM
7:31 PM - 10:01 PM

Minor Periods

1:02 PM - 2:32 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Heat Advisory issued August 14 at 7:55PM EDT until August 15 at 7:00PM EDT by NWS Jacksonville FL

Effective: Thu August 14, 2025, 7:55 PM
Expires: Fri August 15, 2025, 5:00 AM

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...From 11 AM to 7 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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


Heat Advisory issued August 14 at 7:55PM EDT until August 15 at 7:00PM EDT by NWS Jacksonville FL

Effective: Thu August 14, 2025, 7:55 PM
Expires: Fri August 15, 2025, 5:00 AM

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...From 11 AM to 7 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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


Heat Advisory issued August 14 at 7:55PM EDT until August 15 at 7:00PM EDT by NWS Jacksonville FL

Effective: Thu August 14, 2025, 7:55 PM
Expires: Fri August 15, 2025, 5:00 AM

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...From 11 AM to 7 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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


Heat Advisory issued August 14 at 7:55PM EDT until August 15 at 7:00PM EDT by NWS Jacksonville FL

Effective: Thu August 14, 2025, 7:55 PM
Expires: Fri August 15, 2025, 5:00 AM

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...From 11 AM to 7 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

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


Heat Advisory issued August 14 at 7:55PM EDT until August 15 at 7:00PM EDT by NWS Jacksonville FL

Effective: Thu August 14, 2025, 7:55 PM
Expires: Fri August 15, 2025, 5:00 AM

* WHAT...Heat index values up to 110 expected. * WHERE...Portions of northeast and northern Florida and southeast Georgia. * WHEN...From 11 AM to 7 PM EDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Friday, August 15, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 90.2°F
Average Humidity: 64%
Chance of Rain: 0%
Wind: 6 mph
UV Index: 2

Air Quality

AQI: 2 - Moderate
PM2.5: 15.97 μg/m3
PM10: 17.63 μg/m3
Carbon Monoxide: 298 μg/m3
Nitrogen Dioxide: 14.3 μg/m3
Sulphur Dioxide: 6.53 μg/m3
Ozone: 88.12 μg/m3

Astronomical

Sunrise: 6:54 AM
Sun Transit: 1:31 PM
Sunset: 8:08 PM
Daylight: 13 hrs 14 mins
Moonrise: 12:26 AM
Moon Transit: 6:25 AM
Moonset: 1:32 PM
Moon Phase: Last Quarter
Moon Illumination: 50.4%

Best Times for Fishing or Hunting

Major Periods

5:55 AM - 8:25 AM
7:31 PM - 10:01 PM

Minor Periods

1:02 PM - 2:32 PM
12:00 AM - 12:00 AM

Action Rating: 2 out of 5

Saturday, August 16, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 89°F
Average Humidity: 70%
Chance of Rain: 0%
Wind: 7.4 mph
UV Index: 2.5

Air Quality

AQI: 2 - Moderate
PM2.5: 25.42 μg/m3
PM10: 26.12 μg/m3
Carbon Monoxide: 363.27 μg/m3
Nitrogen Dioxide: 11.98 μg/m3
Sulphur Dioxide: 11.51 μg/m3
Ozone: 118.92 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 1:30 PM
Sunset: 8:07 PM
Daylight: 13 hrs 12 mins
Moonrise: 12:08 AM
Moon Transit: 7:21 AM
Moonset: 2:42 PM
Moon Phase: Last Quarter
Moon Illumination: 39.1%

Best Times for Fishing or Hunting

Major Periods

6:51 AM - 9:21 AM
8:30 PM - 11:00 PM

Minor Periods

2:12 PM - 3:42 PM
12:00 AM - 12:00 AM

Action Rating: 4 out of 5

Sunday, August 17, 2025

Weather Forecast

Conditions: Partly Cloudy
Average Temperature: 87.3°F
Average Humidity: 75%
Chance of Rain: 0%
Wind: 8.1 mph
UV Index: 1.9

Air Quality

AQI: 2 - Moderate
PM2.5: 20.48 μg/m3
PM10: 21.25 μg/m3
Carbon Monoxide: 325.38 μg/m3
Nitrogen Dioxide: 10.04 μg/m3
Sulphur Dioxide: 10.55 μg/m3
Ozone: 129.36 μg/m3

Astronomical

Sunrise: 6:55 AM
Sun Transit: 1:30 PM
Sunset: 8:06 PM
Daylight: 13 hrs 11 mins
Moonrise: 12:55 AM
Moon Transit: 8:20 AM
Moonset: 3:51 PM
Moon Phase: Last Quarter
Moon Illumination: 28.4%

Best Times for Fishing or Hunting

Major Periods

7:50 AM - 10:20 AM
12:00 AM - 12:00 AM

Minor Periods

3:21 PM - 4:51 PM
12:25 AM - 1:55 AM

Action Rating: 2 out of 5

Monday, August 18, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 85.1°F
Average Humidity: 67%
Chance of Rain: 0%
Wind: 11.4 mph
UV Index: 2.1

Air Quality

AQI: 1 - Good
PM2.5: 13.11 μg/m3
PM10: 15.57 μg/m3
Carbon Monoxide: 353.78 μg/m3
Nitrogen Dioxide: 16.66 μg/m3
Sulphur Dioxide: 5.39 μg/m3
Ozone: 73.31 μg/m3

Astronomical

Sunrise: 6:56 AM
Sun Transit: 1:30 PM
Sunset: 8:05 PM
Daylight: 13 hrs 9 mins
Moonrise: 1:51 AM
Moon Transit: 9:22 AM
Moonset: 4:55 PM
Moon Phase: Last Quarter
Moon Illumination: 18.9%

Best Times for Fishing or Hunting

Major Periods

8:52 AM - 11:22 AM
12:00 AM - 12:00 AM

Minor Periods

4:25 PM - 5:55 PM
1:21 AM - 2:51 AM

Action Rating: 2 out of 5

Tuesday, August 19, 2025

Weather Forecast

Conditions: Sunny
Average Temperature: 83.9°F
Average Humidity: 65%
Chance of Rain: 0%
Wind: 11.6 mph
UV Index: 0

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: 6:56 AM
Sun Transit: 1:30 PM
Sunset: 8:04 PM
Daylight: 13 hrs 7 mins
Moonrise: 2:54 AM
Moon Transit: 10:24 AM
Moonset: 5:51 PM
Moon Phase: Waning Crescent
Moon Illumination: 10.9%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
9:54 AM - 12:24 AM

Minor Periods

5:21 PM - 6:51 PM
2:24 AM - 3:54 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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