Captain's Flats water temperature

Captain's Flats · Sea/Coast

The current water temperature at Captain's Flats is 21.0 °C (as of August 17, 2026, source: USGS · Proxy).

The sea lags the air by weeks: the warmest water often arrives after the warmest days. Measured buoy values show this honestly.

21.0 °C

Measured: August 17, 2026 · continuously updated

💧 Water 21.0° · ☀️ Air 12.8° · high today 17.2°

Temperature trend of recent weeks

Measurement series & statistics

This measurement series includes 217 data points since July 22, 2026.

Lowest recorded value: 11.9 °C on July 23, 2026 · highest value: 21.2 °C on August 12, 2026.

Nearby waters

Kingston Bay near South Duxbury, Massachusetts · 1.3 km away21.0 °C Atlantic, Cape Cod · 28.9 km away18.6 °C Pumphouse on Assawompset Pond near Lakeville, Massachusetts · 29.4 km away21.7 °C Atlantic, Cape Cod Bay, MA (221) · 33.2 km away18.6 °C Sippican Harbor near Marion Golf Club at Marion, Massachusetts · 33.9 km away22.0 °C

Frequently asked questions

Can you swim at Captain's Flats right now?
The current water temperature is 21.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Captain's Flats?
Currently 21.0 °C (updated continuously).

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