Plum Island Beach water temperature

Plum Island Beach · Sea/Coast

The current water temperature at Plum Island Beach is 21.1 °C (as of August 20, 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.

21.1 °C

Measured: August 20, 2026 · continuously updated

💧 Water 21.1° · ☀️ Air 12.2° · high today 16.6°

Temperature trend of recent weeks

Water quality

Official EPA rating: good

Measurement series & statistics

This measurement series includes 184 data points since July 22, 2026.

Lowest recorded value: 11.7 °C on July 23, 2026 · highest value: 25.1 °C on August 5, 2026.

Nearby waters

Merrimack River Estuary Us of Shad Creek, Salisbury, Massachusetts · 1.9 km away21.1 °C Atlantic, Hampton Beach · 10.1 km away19.3 °C Atlantic, Great Bay Buoy · 28.7 km away19.3 °C Great Bay · 28.8 km away20.3 °C Atlantic, Seavey Island · 29.9 km away16.7 °C

Frequently asked questions

Can you swim at Plum Island Beach right now?
The current water temperature is 21.1 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Plum Island Beach?
Currently 21.1 °C (updated continuously).

How is the water quality at Plum Island Beach?
The official classification is: good.

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