Madison River below Hebgen Lake near Grayling, Montana water temperature

Madison River below Hebgen Lake near Grayling, Montana · River

The current water temperature at Madison River below Hebgen Lake near Grayling is 17.1 °C (as of August 31, 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.

17.1 °C

Measured: August 31, 2026 · continuously updated

💧 Water 17.1° · ☀️ Air 18.3°

Temperature trend of recent weeks

Madison River below Hebgen Lake near Grayling, Montana — Photo: Forest Service - Northern Region · Public domain · Wikimedia Commons

Measurement series & statistics

This measurement series includes 334 data points since July 3, 2026.

Lowest recorded value: 13.0 °C on July 13, 2026 · highest value: 17.9 °C on August 4, 2026.

Nearby waters

Madison River at Kirby Ranch near Cameron, Montana · 19.2 km away18.8 °C Madison River near West Yellowstone, Montana · 31.6 km away19.7 °C Red Rock Creek above Lakes, near Lakeview, Montana · 35.9 km away14.7 °C Gibbon River at Madison Jct, Ynp · 45.3 km away20.1 °C Firehole River near West Yellowstone, Montana · 46.5 km away23.0 °C

Frequently asked questions

Can you swim at Madison River below Hebgen Lake near Grayling right now?
The current water temperature is 17.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Madison River below Hebgen Lake near Grayling?
Currently 17.1 °C (updated continuously).

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