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Koszalin Weather by Month
Average temperatures, rainfall and humidity for Koszalin, Poland, month by month, built from OpenWeather’s historical records. Use it to see what a typical Koszalin month looks like before you travel — then check the live Koszalin forecast for the days ahead.
Warmest month
August
23°C average high
Coolest month
January
-1°C average low
Wettest month
December
227 mm of rain
Driest month
April
36 mm of rain
Average temperature and rainfall in Koszalin by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 3°C | -1°C | -18°C / 14°C | 180 mm | 83% | 19 km/h |
| February | 4°C | -1°C | -22°C / 14°C | 38 mm | 85% | 18 km/h |
| March | 7°C | 1°C | -23°C / 20°C | 54 mm | 80% | 16 km/h |
| April | 12°C | 4°C | -5°C / 27°C | 36 mm | 74% | 17 km/h |
| May | 17°C | 8°C | -1°C / 28°C | 43 mm | 73% | 16 km/h |
| June | 21°C | 12°C | 4°C / 36°C | 54 mm | 75% | 15 km/h |
| July | 22°C | 14°C | 6°C / 36°C | 73 mm | 76% | 16 km/h |
| August | 23°C | 14°C | 5°C / 34°C | 60 mm | 73% | 14 km/h |
| September | 19°C | 12°C | 3°C / 31°C | 49 mm | 75% | 16 km/h |
| October | 14°C | 8°C | -3°C / 23°C | 83 mm | 80% | 18 km/h |
| November | 8°C | 3°C | -8°C / 29°C | 177 mm | 84% | 17 km/h |
| December | 5°C | 1°C | -12°C / 14°C | 227 mm | 84% | 19 km/h |
Best time to visit Koszalin
The most comfortable time to visit Koszalin is generally June to August, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around December, totalling about 1,075 mm a year.
Travellers who prefer heat should aim for August, when highs average 23°C. December is the month to avoid if rain would spoil your plans — it averages 227 mm, roughly 6× the rainfall of the driest month (April).
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Koszalin forecast for what is happening now.