Water Temperature of the St. Johns River in Jacksonville, FL
Current Water Temperature
Measurement Time: Friday, July 25, 2025, 6:30 PM EDT
Temperature Locations
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Local Points of Interest
Riverfront Park; Marco LakeSponsored Content
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)
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St. Johns River, Jacksonville, FL (8.3 mi)
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Dunn Creek, Jacksonville, FL (11.0 mi)
Julington Creek, Jacksonville, FL (12.4 mi)
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Weather for Jacksonville, Florida
Current Weather

Humidity: 80%
Feels Like: 95.3°F
Wind: SE 5.1 mph
Wind Gusts: 8.2 mph
Precipitation: 0 in
Cloud Cover: 75%
Visibility: 9 mi
UV Index: 0
Five Day Weather Forecast

Fri
H: 96°F
L: 80°F

Sat
H: 98°F
L: 81°F

Sun
H: 104°F
L: 84°F

Mon
H: 102°F
L: 86°F

Tue
H: 97°F
L: 77°F
Air Quality
Nitrogen Dioxide: 22.57 μg/m3
Sulphur Dioxide: 4.63 μg/m3
Ozone: 32 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:25 PM
Daylight: 13 hrs 44 mins
Moon Transit: 2:26 PM
Moonset: 9:22 PM
Moon Phase: New
Moon Illumination: 3.1%
Best Times for Fishing or Hunting
Major Periods
2:39 AM - 5:09 AM1:56 PM - 4:26 PM
Minor Periods
8:52 PM - 10:22 PM6:52 AM - 8:22 AM
Action Rating: 5 out of 5
Heat Advisory issued July 25 at 1:07PM EDT until July 26 at 7:00PM EDT by NWS Jacksonville FL
Effective: Fri July 25, 2025, 1:07 PM
Expires: Sat July 26, 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 Saturday. * 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Heat Advisory issued July 25 at 1:07PM EDT until July 26 at 7:00PM EDT by NWS Jacksonville FL
Effective: Fri July 25, 2025, 1:07 PM
Expires: Sat July 26, 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 Saturday. * 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Heat Advisory issued July 25 at 1:07PM EDT until July 26 at 7:00PM EDT by NWS Jacksonville FL
Effective: Fri July 25, 2025, 1:07 PM
Expires: Sat July 26, 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 Saturday. * 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Heat Advisory issued July 25 at 1:07PM EDT until July 26 at 7:00PM EDT by NWS Jacksonville FL
Effective: Fri July 25, 2025, 1:07 PM
Expires: Sat July 26, 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 Saturday. * 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Heat Advisory issued July 25 at 1:07PM EDT until July 26 at 7:00PM EDT by NWS Jacksonville FL
Effective: Fri July 25, 2025, 1:07 PM
Expires: Sat July 26, 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 Saturday. * 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1.
Weather Forecast
Average Temperature: 86.5°F
Average Humidity: 76%
Wind: 9.8 mph
UV Index: 2.5
Air Quality
Nitrogen Dioxide: 10.72 μg/m3
Sulphur Dioxide: 7.34 μg/m3
Ozone: 66.36 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:25 PM
Daylight: 13 hrs 44 mins
Moon Transit: 2:26 PM
Moonset: 9:22 PM
Moon Phase: New
Moon Illumination: 3.1%
Best Times for Fishing or Hunting
Major Periods
2:39 AM - 5:09 AM1:56 PM - 4:26 PM
Minor Periods
8:52 PM - 10:22 PM6:52 AM - 8:22 AM
Action Rating: 5 out of 5
Weather Forecast
Average Temperature: 88.9°F
Average Humidity: 71%
Wind: 9.4 mph
UV Index: 2.6
Air Quality
Nitrogen Dioxide: 15.8 μg/m3
Sulphur Dioxide: 8.58 μg/m3
Ozone: 97.6 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:25 PM
Daylight: 13 hrs 43 mins
Moon Transit: 3:15 PM
Moonset: 9:55 PM
Moon Phase: New
Moon Illumination: 0.7%
Best Times for Fishing or Hunting
Major Periods
3:30 AM - 6:00 AM2:45 PM - 5:15 PM
Minor Periods
9:25 PM - 10:55 PM7:57 AM - 9:27 AM
Action Rating: 3 out of 5
Weather Forecast
Average Temperature: 92.6°F
Average Humidity: 60%
Wind: 11.2 mph
UV Index: 2.8
Air Quality
Nitrogen Dioxide: 13.93 μg/m3
Sulphur Dioxide: 6.44 μg/m3
Ozone: 107.48 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:24 PM
Daylight: 13 hrs 41 mins
Moon Transit: 4:00 PM
Moonset: 10:24 PM
Moon Phase: New
Moon Illumination: 3.8%
Best Times for Fishing or Hunting
Major Periods
4:16 AM - 6:46 AM3:30 PM - 6:00 PM
Minor Periods
9:54 PM - 11:24 PM8:57 AM - 10:27 AM
Action Rating: 4 out of 5
Weather Forecast
Average Temperature: 93°F
Average Humidity: 55%
Wind: 12.1 mph
UV Index: 2.6
Air Quality
Nitrogen Dioxide: 12.71 μg/m3
Sulphur Dioxide: 6.12 μg/m3
Ozone: 126.08 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:23 PM
Daylight: 13 hrs 40 mins
Moon Transit: 4:41 PM
Moonset: 10:51 PM
Moon Phase: Waxing Crescent
Moon Illumination: 9.3%
Best Times for Fishing or Hunting
Major Periods
4:59 AM - 7:29 AM4:11 PM - 6:41 PM
Minor Periods
10:21 PM - 11:51 PM9:55 AM - 11:25 AM
Action Rating: 2 out of 5
Weather Forecast
Average Temperature: 85.9°F
Average Humidity: 62%
Wind: 10.5 mph
UV Index: 1.9
Air Quality
Nitrogen Dioxide: 16.79 μg/m3
Sulphur Dioxide: 6.32 μg/m3
Ozone: 99.77 μg/m3
Astronomical
Sun Transit: 1:33 PM
Sunset: 8:23 PM
Daylight: 13 hrs 39 mins
Moon Transit: 5:22 PM
Moonset: 11:16 PM
Moon Phase: Waxing Crescent
Moon Illumination: 16.9%
Best Times for Fishing or Hunting
Major Periods
5:40 AM - 8:10 AM4:52 PM - 7:22 PM
Minor Periods
12:00 AM - 12:00 AM10:50 AM - 12:20 AM
Action Rating: 2 out of 5