Baltic Sea water temperature

Baltic Sea, Naantali · Sea/Coast

The current water temperature at Baltic Sea is 18.0 °C (as of September 1, 2026, source: Open-Meteo marine model).

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

18.0 °C

Measured: September 1, 2026 · continuously updated

💧 Water 18.0° · ☀️ Air 14.9° · high today 20.1°

Temperature trend of recent weeks

Water quality

EU classification: excellent

Measurement series & statistics

This measurement series includes 589 data points since July 3, 2026.

Lowest recorded value: 17.1 °C on August 26, 2026 · highest value: 22.0 °C on July 14, 2026.

Nearby waters

Pyhäjärvi, Säkylä · 71.8 km away17.7 °C Baltic Sea, Hanko / Bellevue · 88.4 km away15.9 °C Kuivajärvi, Tammela · 105.4 km away16.8 °C Lohjanjärvi, Lohja · 105.5 km away17.9 °C Baltic Sea, Mariehamn (Åland) · 122.3 km away17.3 °C

More measuring points: Baltic Sea

Färjestaden, Granudden/Talludd22.0 °C Hägernäsbadet22.0 °C Näsaängsbadet22.0 °C Eriksöre camping, Eriksöre21.0 °C Nickstabadet21.0 °C Saxnäs21.0 °C

Frequently asked questions

Can you swim at Baltic Sea right now?
The current water temperature is 18.0 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Baltic Sea?
Currently 18.0 °C (updated continuously).

How is the water quality at Baltic Sea?
The official classification is: excellent.

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