St Johns River water temperature
St Johns River, Shands Bridge near Grn Cove Sprg, Florida · River
The current water temperature at St Johns River is 28.9 °C (as of September 21, 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 289 data points since July 23, 2026.
Lowest recorded value: 28.8 °C on August 4, 2026 · highest value: 33.1 °C on August 19, 2026.
In September, temperatures have ranged between 28.9 °C and 31.0 °C.
The current value is 0.9 °C below the September average of this series.
Nearby waters
More measuring points: St Johns River
Frequently asked questions
Can you swim at St Johns River 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?
Currently 28.9 °C (updated continuously).
How warm is at St Johns River in September?
In September, the water temperature recently averaged 29.8 °C.
When is the water warmest at St Johns River?
Across the measurement record, July is on average the warmest month (31.4 °C).
