Stony Brook at RT 20 at Waltham, Massachusetts water temperature

Stony Brook at RT 20 at Waltham, Massachusetts · River

The current water temperature at Stony Brook at RT 20 at Waltham is 23.3 °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.

23.3 °C

Measured: September 1, 2026 · continuously updated

💧 Water 23.3° · ☀️ Air 21.4°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 496 data points since July 3, 2026.

Lowest recorded value: 20.3 °C on July 31, 2026 · highest value: 27.4 °C on August 8, 2026.

Nearby waters

Stony Brook, Unnamed Tributary 1, near Waltham, Massachusetts · 0.4 km away14.7 °C Stony Brook Unnamed Trib 2 near Weston Station · 0.5 km away21.2 °C Stony Brook Reservoir, Unnamed Trib 1, near Weston, Massachusetts · 1.6 km away16.8 °C Stony Brook at Viles Street, near Weston, Massachusetts · 2.4 km away19.4 °C Hobbs Bk below Cambridge Reservoir near Kendall Green, Massachusetts · 3.3 km away24.0 °C

Frequently asked questions

Can you swim at Stony Brook at RT 20 at Waltham right now?
The current water temperature is 23.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Stony Brook at RT 20 at Waltham?
Currently 23.3 °C (updated continuously).

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