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

Current Water Temperature

79.3°F

Measurement Time: Saturday, October 4, 2025, 7:30 AM 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

82°F
Partly cloudy
Conditions: Partly cloudy
Humidity: 65%
Feels Like: 86.3°F
Wind: E 11.9 mph
Wind Gusts: 13.6 mph
Pressure: 30.07 in
Precipitation: 0 in
Cloud Cover: 75%
Visibility: 9 mi
UV Index: 6

Five Day Weather Forecast

Moderate rain
Sat
H: 85°F
L: 71°F
Heavy rain
Sun
H: 83°F
L: 76°F
Heavy rain
Mon
H: 81°F
L: 76°F
Patchy rain nearby
Tue
H: 85°F
L: 74°F
Patchy rain nearby
Wed
H: 86°F
L: 73°F

Air Quality

AQI: 1 - Good
PM2.5: 7.55 μg/m3
PM10: 11.45 μg/m3
Carbon Monoxide: 134.85 μg/m3
Nitrogen Dioxide: 2.65 μg/m3
Sulphur Dioxide: 2.85 μg/m3
Ozone: 91 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 1:15 PM
Sunset: 7:08 PM
Daylight: 11 hrs 46 mins
Moonrise: 5:42 PM
Moon Transit: 11:34 PM
Moonset: 4:30 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 94.0%

Best Times for Fishing or Hunting

Major Periods

11:49 AM - 2:19 PM
12:00 AM - 12:00 AM

Minor Periods

5:12 PM - 6:42 PM
4:00 AM - 5:30 AM

Action Rating: 3 out of 5

Coastal Flood Warning issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...Significant flooding around times of high tide. * WHERE...St Johns River Basin. * WHEN...Until 5 AM EDT Tuesday. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth.


High Surf Advisory issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Warning, significant coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Duval, Coastal Flagler, Northeast Coastal St. Johns and Southeast Coastal St. Johns Counties. * WHEN...For the Coastal Flood Warning, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Rip Current Statement issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Warning, significant coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Duval, Coastal Flagler, Northeast Coastal St. Johns and Southeast Coastal St. Johns Counties. * WHEN...For the Coastal Flood Warning, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Coastal Flood Warning issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Warning, significant coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Duval, Coastal Flagler, Northeast Coastal St. Johns and Southeast Coastal St. Johns Counties. * WHEN...For the Coastal Flood Warning, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Numerous roads may be closed. Low lying property including homes, businesses, and some critical infrastructure will be inundated. Some shoreline erosion will occur. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

Take the necessary actions to protect flood-prone property. If travel is required, do not drive around barricades or through water of unknown depth. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Coastal Flood Advisory issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Advisory, minor coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Nassau County. * WHEN...For the Coastal Flood Advisory, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


High Surf Advisory issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Advisory, minor coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Nassau County. * WHEN...For the Coastal Flood Advisory, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Rip Current Statement issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Advisory, minor coastal flooding around times of high tide. For the High Surf Advisory, large breaking waves of 5 to 7 feet. For the High Rip Current Risk, dangerous rip currents. * WHERE...Coastal Nassau County. * WHEN...For the Coastal Flood Advisory, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Dangerous swimming and surfing conditions and localized beach erosion. Rip currents can sweep even the best swimmers away from shore into deeper water.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Inexperienced swimmers should remain out of the water due to dangerous surf conditions. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Rip Current Statement issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Advisory, minor coastal flooding around times of high tide. For the High Rip Current Risk, dangerous rip currents. * WHERE...Southeast Georgia Beaches. * WHEN...For the Coastal Flood Advisory, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Rip currents can sweep even the best swimmers away from shore into deeper water.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Coastal Flood Advisory issued October 4 at 1:59AM EDT until October 7 at 5:00AM EDT by NWS Jacksonville FL

Effective: Sat October 4, 2025, 1:59 AM
Expires: Sun October 5, 2025, 5:00 AM

* WHAT...For the Coastal Flood Advisory, minor coastal flooding around times of high tide. For the High Rip Current Risk, dangerous rip currents. * WHERE...Southeast Georgia Beaches. * WHEN...For the Coastal Flood Advisory, until 5 AM EDT Tuesday. For the High Rip Current Risk, through late Monday night. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. Rip currents can sweep even the best swimmers away from shore into deeper water.

If travel is required, allow extra time as some roads may be closed. Do not drive around barricades or through water of unknown depth. Take the necessary actions to protect flood-prone property. Swim near a lifeguard. If caught in a rip current, relax and float. Don't swim against the current. If able, swim in a direction following the shoreline. If unable to escape, face the shore and call or wave for help.


Saturday, October 4, 2025

Weather Forecast

Conditions: Moderate rain
Average Temperature: 76.3°F
Average Humidity: 82%
Chance of Rain: 73%
Wind: 12.5 mph
UV Index: 1.6

Air Quality

AQI: 1 - Good
PM2.5: 6.58 μg/m3
PM10: 9.96 μg/m3
Carbon Monoxide: 139.37 μg/m3
Nitrogen Dioxide: 3.37 μg/m3
Sulphur Dioxide: 2.27 μg/m3
Ozone: 83.52 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 1:15 PM
Sunset: 7:08 PM
Daylight: 11 hrs 46 mins
Moonrise: 5:42 PM
Moon Transit: 11:34 PM
Moonset: 4:30 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 94.0%

Best Times for Fishing or Hunting

Major Periods

11:49 AM - 2:19 PM
12:00 AM - 12:00 AM

Minor Periods

5:12 PM - 6:42 PM
4:00 AM - 5:30 AM

Action Rating: 3 out of 5

Sunday, October 5, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 78.6°F
Average Humidity: 82%
Chance of Rain: 89%
Wind: 13 mph
UV Index: 1.5

Air Quality

AQI: 1 - Good
PM2.5: 6.44 μg/m3
PM10: 9.7 μg/m3
Carbon Monoxide: 141.13 μg/m3
Nitrogen Dioxide: 3.47 μg/m3
Sulphur Dioxide: 2.16 μg/m3
Ozone: 81.16 μg/m3

Astronomical

Sunrise: 7:22 AM
Sun Transit: 1:14 PM
Sunset: 7:07 PM
Daylight: 11 hrs 44 mins
Moonrise: 6:14 PM
Moon Transit: 12:00 AM
Moonset: 5:35 AM
Moon Phase: Waxing Gibbous
Moon Illumination: 98.2%

Best Times for Fishing or Hunting

Major Periods

12:00 AM - 12:00 AM
12:00 AM - 12:00 AM

Minor Periods

5:44 PM - 7:14 PM
5:05 AM - 6:35 AM

Action Rating: 3 out of 5

Monday, October 6, 2025

Weather Forecast

Conditions: Heavy rain
Average Temperature: 78.5°F
Average Humidity: 86%
Chance of Rain: 81%
Wind: 13.6 mph
UV Index: 1.2

Air Quality

AQI: 1 - Good
PM2.5: 6.03 μg/m3
PM10: 8.98 μg/m3
Carbon Monoxide: 136.49 μg/m3
Nitrogen Dioxide: 3.46 μg/m3
Sulphur Dioxide: 2.1 μg/m3
Ozone: 78.44 μg/m3

Astronomical

Sunrise: 7:23 AM
Sun Transit: 1:14 PM
Sunset: 7:05 PM
Daylight: 11 hrs 42 mins
Moonrise: 6:47 PM
Moon Transit: 1:38 AM
Moonset: 6:42 AM
Moon Phase: Full
Moon Illumination: 100.0%

Best Times for Fishing or Hunting

Major Periods

1:08 AM - 3:38 AM
1:08 AM - 3:38 AM

Minor Periods

6:17 PM - 7:47 PM
6:12 AM - 7:42 AM

Action Rating: 4 out of 5

Tuesday, October 7, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 79.2°F
Average Humidity: 72%
Chance of Rain: 89%
Wind: 11.2 mph
UV Index: 1.7

Air Quality

AQI: 1 - Good
PM2.5: 7.63 μg/m3
PM10: 11.41 μg/m3
Carbon Monoxide: 138.41 μg/m3
Nitrogen Dioxide: 3.56 μg/m3
Sulphur Dioxide: 2.44 μg/m3
Ozone: 77.32 μg/m3

Astronomical

Sunrise: 7:24 AM
Sun Transit: 1:14 PM
Sunset: 7:04 PM
Daylight: 11 hrs 41 mins
Moonrise: 7:21 PM
Moon Transit: 1:13 AM
Moonset: 7:50 AM
Moon Phase: Full
Moon Illumination: 99.1%

Best Times for Fishing or Hunting

Major Periods

12:43 AM - 3:13 AM
2:18 PM - 4:48 PM

Minor Periods

6:51 PM - 8:21 PM
7:20 AM - 8:50 AM

Action Rating: 5 out of 5

Wednesday, October 8, 2025

Weather Forecast

Conditions: Patchy rain nearby
Average Temperature: 78.6°F
Average Humidity: 70%
Chance of Rain: 87%
Wind: 8.7 mph
UV Index: 0

Air Quality

AQI: 1 - Good
PM2.5: 7.37 μg/m3
PM10: 10.88 μg/m3
Carbon Monoxide: 143.16 μg/m3
Nitrogen Dioxide: 5.4 μg/m3
Sulphur Dioxide: 2.47 μg/m3
Ozone: 71.15 μg/m3

Astronomical

Sunrise: 7:24 AM
Sun Transit: 1:14 PM
Sunset: 7:03 PM
Daylight: 11 hrs 39 mins
Moonrise: 8:00 PM
Moon Transit: 2:06 AM
Moonset: 9:02 AM
Moon Phase: Full
Moon Illumination: 95.8%

Best Times for Fishing or Hunting

Major Periods

1:36 AM - 4:06 AM
3:13 PM - 5:43 PM

Minor Periods

7:30 PM - 9:00 PM
8:32 AM - 10:02 AM

Action Rating: 4 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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