Baltic Sea water temperature

Baltic Sea, Arkösund · Sea/Coast

The current water temperature at Baltic Sea is 17.3 °C (as of September 1, 2026, source: official monitoring networks).

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

17.3 °C

Measured: September 1, 2026 · continuously updated

💧 Water 17.3° · ☀️ Air 16.0° · high today 18.4°

Temperature trend of recent weeks

Baltic Sea — Photo: jaakkoafs · CC BY-SA 3.0 · Wikimedia Commons

Measurement series & statistics

This measurement series includes 736 data points since July 3, 2026.

Lowest recorded value: 14.6 °C on August 11, 2026 · highest value: 22.2 °C on July 17, 2026.

In September, temperatures have ranged between 17.3 °C and 17.4 °C.

Nearby waters

Baltic Sea, Oxelösund · 21.9 km away18.0 °C Baltic Sea, Bråviken · 40.0 km away16.8 °C Baltic Sea, Trosa Havsbad · 55.8 km away17.0 °C Baltic Sea, Landsort · 60.9 km away17.7 °C Baltic Sea, Tättö Havsbad · 67.9 km away16.0 °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 17.3 °C. See live swimming conditions, weather and quality in the BrrChecker app.

How warm is the water at Baltic Sea?
Currently 17.3 °C (updated continuously).

How warm is at Baltic Sea in September?
In September, the water temperature recently averaged 17.3 °C.

When is the water warmest at Baltic Sea?
Across the measurement record, July is on average the warmest month (18.7 °C).

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