St. Croix River water temperature
St. Croix River, Stillwater, Minnesota · River
The current water temperature at St. Croix River is 17.0 °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.
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Measurement series & statistics
This measurement series includes 393 data points since July 23, 2026.
Lowest recorded value: 17.0 °C on September 21, 2026 · highest value: 28.8 °C on July 30, 2026.
In September, temperatures have ranged between 17.0 °C and 26.7 °C.
The current value is 7.7 °C below the September average of this series.
Nearby waters
More measuring points: St. Croix River
Frequently asked questions
Can you swim at St. Croix River right now?
The current water temperature is 17.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at St. Croix River?
Currently 17.0 °C (updated continuously).
How warm is at St. Croix River in September?
In September, the water temperature recently averaged 24.7 °C.
When is the water warmest at St. Croix River?
Across the measurement record, July is on average the warmest month (26.7 °C).
