Stony Brook Reservoir, Unnamed Trib 1, near Weston, Massachusetts water temperature

Stony Brook Reservoir, Unnamed Trib 1, near Weston, Massachusetts · River

The current water temperature at Stony Brook Reservoir is 16.8 °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.

16.8 °C

Measured: August 31, 2026 · continuously updated

💧 Water 16.8° · ☀️ Air 21.4°

Temperature trend of recent weeks

Stony Brook Reservoir, Unnamed Trib 1, near Weston, Massachusetts — Photo: ArnoldReinhold · CC BY 3.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 487 data points since July 3, 2026.

Lowest recorded value: 13.7 °C on July 27, 2026 · highest value: 21.4 °C on August 3, 2026.

Nearby waters

Stony Brook at RT 20 at Waltham, Massachusetts · 1.6 km away23.3 °C Stony Brook Unnamed Trib 2 near Weston Station · 2.0 km away21.2 °C Stony Brook, Unnamed Tributary 1, near Waltham, Massachusetts · 2.0 km away14.7 °C Stony Brook at Viles Street, near Weston, Massachusetts · 3.9 km away19.4 °C Hobbs Bk below Cambridge Reservoir near Kendall Green, Massachusetts · 4.9 km away24.0 °C

Frequently asked questions

Can you swim at Stony Brook Reservoir right now?
The current water temperature is 16.8 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Stony Brook Reservoir?
Currently 16.8 °C (updated continuously).

← All waters