Jefferson River near Three Forks, Montana water temperature

Jefferson River near Three Forks, Montana · River

The current water temperature at Jefferson River near Three Forks is 20.2 °C (as of September 1, 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.

20.2 °C

Measured: September 1, 2026 · continuously updated

💧 Water 20.2° · ☀️ Air 23.8° · high today 27.0°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 296 data points since July 3, 2026.

Lowest recorded value: 16.2 °C on August 31, 2026 · highest value: 26.8 °C on July 25, 2026.

Nearby waters

Gallatin River at Logan, Montana · 12.0 km away18.9 °C Willow Creek near Harrison, Montana · 22.4 km away20.0 °C Missouri River at Toston, Montana · 30.9 km away19.4 °C Madison River near Norris, Montana · 32.2 km away22.1 °C Madison River below Ennis Lake near McAllister, Montana · 45.3 km away19.0 °C

Frequently asked questions

Can you swim at Jefferson River near Three Forks right now?
The current water temperature is 20.2 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Jefferson River near Three Forks?
Currently 20.2 °C (updated continuously).

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