Baltic Sea water temperature
Baltic Sea, Kalmar · Sea/Coast
The current water temperature at Baltic Sea is 11.7 °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.
Water quality
EU classification: excellentMeasurement series & statistics
This measurement series includes 728 data points since August 17, 2026.
Lowest recorded value: 11.3 °C on October 15, 2026 · highest value: 19.5 °C on August 27, 2026.
In October, temperatures have ranged between 11.3 °C and 14.8 °C.
The current value is 1.5 °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 11.7 °C. See live swimming conditions, weather and quality in the BrrChecker app.
How warm is the water at Baltic Sea?
Currently 11.7 °C (updated continuously).
How warm is at Baltic Sea in October?
In October, the water temperature recently averaged 13.2 °C.
When is the water warmest at Baltic Sea?
Across the measurement record, August is on average the warmest month (18.7 °C).
How is the water quality at Baltic Sea?
The official classification is: excellent.
