St. Johns River at Jacksonville, Florida water temperature
St. Johns River at Jacksonville, Florida · River
The current water temperature at St. Johns River at Jacksonville is 28.9 °C (as of September 20, 2026, source: USGS).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
Measurement series & statistics
This measurement series includes 265 data points since July 22, 2026.
Lowest recorded value: 28.5 °C on September 19, 2026 · highest value: 32.2 °C on July 28, 2026.
In September, temperatures have ranged between 28.5 °C and 30.6 °C.
The current value is 0.8 °C below the September average of this series.
Nearby waters
Frequently asked questions
Can you swim at St. Johns River at Jacksonville right now?
The current water temperature is 28.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Johns River at Jacksonville?
Currently 28.9 °C (updated continuously).
How warm is at St. Johns River at Jacksonville in September?
In September, the water temperature recently averaged 29.7 °C.
When is the water warmest at St. Johns River at Jacksonville?
Across the measurement record, July is on average the warmest month (31.0 °C).
