South Fork Tolt River near Index, Washington water temperature

South Fork Tolt River near Index, Washington · River

The current water temperature at South Fork Tolt River near Index is 12.7 °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.

12.7 °C

Measured: August 31, 2026 · continuously updated

💧 Water 12.7° · ☀️ Air 21.7°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 257 data points since July 3, 2026.

Lowest recorded value: 10.2 °C on July 3, 2026 · highest value: 15.6 °C on August 21, 2026.

Nearby waters

South Fork Tolt River near Carnation, Washington · 8.7 km away12.6 °C Nf Tolt River above Yellow Creek near Carnation, Washington · 10.8 km away14.2 °C Sf Tolt River below Regulating Basin near Carnation, Washington · 14.1 km away14.0 °C North Fork Tolt River near Carnation, Washington · 14.1 km away11.6 °C Skykomish River near Gold Bar, Washington · 15.3 km away18.4 °C

Frequently asked questions

Can you swim at South Fork Tolt River near Index right now?
The current water temperature is 12.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at South Fork Tolt River near Index?
Currently 12.7 °C (updated continuously).

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