Baltic Sea water temperature
Baltic Sea, Bråviken · Sea/Coast
The current water temperature at Baltic Sea is 9.6 °C (as of October 16, 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.
Measurement series & statistics
This measurement series includes 678 data points since August 17, 2026.
Lowest recorded value: 9.3 °C on October 14, 2026 · highest value: 17.8 °C on September 2, 2026.
In October, temperatures have ranged between 9.3 °C and 12.4 °C.
The current value is 0.8 °C below the October average of this series.
Nearby waters
More measuring points: Baltic Sea
Frequently asked questions
Can you swim at Baltic Sea right now?
The current water temperature is 9.6 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Baltic Sea?
Currently 9.6 °C (updated continuously).
How warm is at Baltic Sea in October?
In October, the water temperature recently averaged 10.4 °C.
When is the water warmest at Baltic Sea?
Across the measurement record, August is on average the warmest month (15.5 °C).
