Tongue River at State Line near Decker, Montana water temperature

Tongue River at State Line near Decker, Montana · River

The current water temperature at Tongue River at State Line near Decker is 22.9 °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.

22.9 °C

Measured: September 1, 2026 · continuously updated

💧 Water 22.9° · ☀️ Air 25.8° · high today 28.3°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 267 data points since July 3, 2026.

Lowest recorded value: 15.6 °C on August 31, 2026 · highest value: 30.2 °C on August 1, 2026.

Nearby waters

Tongue River at Tongue River Dam near Decker, Montana · 15.5 km away22.6 °C Bighorn River at bridge, at St. Xavier, Montana · 87.4 km away14.5 °C Tongue River below Brandenberg bridge near Ashland, Montana · 104.1 km away22.6 °C Shoshone River near Lovell, Wyoming · 127.3 km away19.2 °C

Frequently asked questions

Can you swim at Tongue River at State Line near Decker right now?
The current water temperature is 22.9 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Tongue River at State Line near Decker?
Currently 22.9 °C (updated continuously).

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