Where is the sea warmest in the Baltic in April?
In April the warmest sea in the Baltic is at Świnoujście, Poland, at 8.5°C. Nowhere in the region is comfortable for swimming this month — not one of the 90 cities measured reaches 19.0°C.
| # | City | Country | Sea | Swimming |
|---|---|---|---|---|
| 1 | Świnoujście | Poland | 8.5°C | Dangerous |
| 2 | Wolin | Poland | 8.5°C | Dangerous |
| 3 | Vejle | Denmark | 8.2°C | Dangerous |
| 4 | Fredericia | Denmark | 8.2°C | Dangerous |
| 5 | Horsens | Denmark | 8.1°C | Dangerous |
| 6 | Århus | Denmark | 8.1°C | Dangerous |
| 7 | Universitäts- und Hansestadt Greifswald | Germany | 8.0°C | Dangerous |
| 8 | Wolgast | Germany | 7.9°C | Dangerous |
| 9 | Frederikshavn | Denmark | 7.9°C | Dangerous |
| 10 | Kappeln | Germany | 7.8°C | Dangerous |
| 11 | Sønderborg | Denmark | 7.8°C | Dangerous |
| 12 | Faaborg | Denmark | 7.8°C | Dangerous |
| 13 | Korsør | Denmark | 7.8°C | Dangerous |
| 14 | Oldenburg in Holstein | Germany | 7.7°C | Dangerous |
| 15 | Halmstad | Sweden | 7.7°C | Dangerous |
| 16 | Fehmarn | Germany | 7.6°C | Dangerous |
| 17 | Bergen auf Rügen | Germany | 7.5°C | Dangerous |
| 18 | Gothenburg | Sweden | 7.5°C | Dangerous |
| 19 | Nykøbing Falster | Denmark | 7.4°C | Dangerous |
| 20 | Roskilde | Denmark | 7.2°C | Dangerous |
| 21 | Helsingborg | Sweden | 7.2°C | Dangerous |
| 22 | Kragerø | Norway | 7.2°C | Dangerous |
| 23 | Sandefjord | Norway | 7.2°C | Dangerous |
| 24 | Tønsberg | Norway | 7.2°C | Dangerous |
| 25 | Kamień Pomorski | Poland | 7.2°C | Dangerous |
Ranked on the NOAA OISST monthly climatology — a long-run average for April, not a forecast. A given April will run warmer or cooler than this, and the sea is warmest late in the afternoon and late in the season.