Baltic Sea water temperature
Baltic Sea, Gdańsk · River
The current water temperature at Baltic Sea is 17.3 °C (as of September 19, 2026, source: IMGW).
A river can change temperature within hours — snowmelt, rain or power-plant operations show up immediately. That is why the measured value counts here, not an estimate.
Measurement series & statistics
This measurement series includes 52 data points since July 23, 2026.
Lowest recorded value: 17.3 °C on September 19, 2026 · highest value: 20.4 °C on August 7, 2026.
In September, temperatures have ranged between 17.3 °C and 18.4 °C.
The current value is 0.6 °C below the September 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 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 17.9 °C.
When is the water warmest at Baltic Sea?
Across the measurement record, August is on average the warmest month (19.2 °C).
