Thames River water temperature

Thames River, Groton, Connecticut · Sea/Coast

The current water temperature at Thames River is 14.3 °C (as of October 29, 2026, source: USGS).

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

14.3 °C

Measured: October 29, 2026 · continuously updated

💧 Water 14.3° · ☀️ Air 16.5°

Water quality

Official EPA rating: poor

Nearby waters

Atlantic, New London · 3.1 km away15.4 °C Atlantic, New London, CT · 3.1 km away15.4 °C Poquonnock River, Bluff Point State Park, Connecticut · 4.6 km away15.1 °C Connecticut River, Old Lyme, Connecticut · 21.8 km away14.2 °C East Branch Eightmile River, North Lyme, Connecticut · 22.5 km away10.7 °C

Frequently asked questions

Can you swim at Thames River right now?
The current water temperature is 14.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Thames River?
Currently 14.3 °C (updated continuously).

How is the water quality at Thames River?
The official classification is: poor.

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