Baltic Sea water temperature
The current Baltic Sea water temperature averages about 17.6°C (Sept. 4, 2026) - measurements from individual coastal points below, warmest first.
| Coastal point | Temperature | Measured |
|---|---|---|
| Hel | 18.7°C | Sept. 4, 2026 |
| Nowy świat - ujście | 18.6°C | Sept. 4, 2026 |
| Władysławowo | 18.1°C | Sept. 4, 2026 |
| Gdynia | 17.9°C | Sept. 4, 2026 |
| Łeba | 17.7°C | Sept. 4, 2026 |
| Łebsko | 17.2°C | Sept. 4, 2026 |
| Kołobrzeg | 17.1°C | Sept. 4, 2026 |
| Dębki | 17.0°C | Sept. 4, 2026 |
| Ustka | 16.3°C | Sept. 4, 2026 |
IMGW station measurements (open sea). At beaches, water near the shore can be warmer in heat and cooler with offshore winds.
Baltic Sea water temperature month by month
Multi-year average water temperature for the Polish coast - roughly how warm the water is in a given month. The current month is highlighted.
| Month | Average | Warmest |
|---|---|---|
| January | 2.6°C | Kąpielisko nr 1 - "Duża Plaża" 3.4°C |
| February | 1.9°C | Kąpielisko nr 3 - "Mała Plaża" 2.8°C |
| March | 3.6°C | Kąpielisko morskie Dziwnów Słoneczne 4.3°C |
| April | 6.9°C | Kąpielisko morskie Świnoujście Bałtycka 9.2°C |
| May | 11.2°C | Kąpielisko morskie Świnoujście Bałtycka 15.3°C |
| June | 16.7°C | Kąpielisko morskie Świnoujście Bałtycka 20.0°C |
| July | 19.8°C | Kąpielisko morskie Świnoujście Bałtycka 21.4°C |
| August | 20.3°C | Kąpielisko morskie Dziwnów Słoneczne 20.8°C |
| September | 18.7°C | Kąpielisko morskie Międzyzdroje Zachód- obszar wodny o długości linii brzegowej 1086 m na zachód od Molo 19.2°C |
| October | 13.7°C | Poddąbie 14.6°C |
| November | 9.0°C | Kąpielisko nr 2 - "Na Cyplu" 10.2°C |
| December | 5.1°C | Kąpielisko nr 3 - "Mała Plaża" 6.6°C |
Frequently asked questions
In which month is the Baltic Sea warmest?
Warmest: August, about 20.3°C on average.
When is the water in the Baltic Sea coldest?
Coldest: February, about 1.9°C on average.
What is the Baltic Sea water temperature in summer?
In summer (June-August) the Baltic Sea water averages about 18.9°C.
Baltic Sea water temperature - January
Average water temperature on the coast (January): about 2.6°C. Warmest: Kąpielisko nr 1 - "Duża Plaża" (3.4°C).
Baltic Sea water temperature - February
Average water temperature on the coast (February): about 1.9°C. Warmest: Kąpielisko nr 3 - "Mała Plaża" (2.8°C).
Baltic Sea water temperature - March
Average water temperature on the coast (March): about 3.6°C. Warmest: Kąpielisko morskie Dziwnów Słoneczne (4.3°C).
Baltic Sea water temperature - April
Average water temperature on the coast (April): about 6.9°C. Warmest: Kąpielisko morskie Świnoujście Bałtycka (9.2°C).
Baltic Sea water temperature - May
Average water temperature on the coast (May): about 11.2°C. Warmest: Kąpielisko morskie Świnoujście Bałtycka (15.3°C).
Baltic Sea water temperature - June
Average water temperature on the coast (June): about 16.7°C. Warmest: Kąpielisko morskie Świnoujście Bałtycka (20.0°C).
Baltic Sea water temperature - July
Average water temperature on the coast (July): about 19.8°C. Warmest: Kąpielisko morskie Świnoujście Bałtycka (21.4°C).
Baltic Sea water temperature - August
Average water temperature on the coast (August): about 20.3°C. Warmest: Kąpielisko morskie Dziwnów Słoneczne (20.8°C).
Baltic Sea water temperature - September
Average water temperature on the coast (September): about 18.7°C. Warmest: Kąpielisko morskie Międzyzdroje Zachód- obszar wodny o długości linii brzegowej 1086 m na zachód od Molo (19.2°C).
Baltic Sea water temperature - October
Average water temperature on the coast (October): about 13.7°C. Warmest: Poddąbie (14.6°C).
Baltic Sea water temperature - November
Average water temperature on the coast (November): about 9.0°C. Warmest: Kąpielisko nr 2 - "Na Cyplu" (10.2°C).
Baltic Sea water temperature - December
Average water temperature on the coast (December): about 5.1°C. Warmest: Kąpielisko nr 3 - "Mała Plaża" (6.6°C).
Bathing sites on the Baltic
Water temperature and sanitary status at popular seaside bathing sites.