Climate Insights for Sławno

The climate in Sławno is cool. The average annual temperature is 9°C and approximately 881mm of precipitation falls per year. July is the wettest month, receiving around 123mm of rainfall. Sławno is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are January, February, March, when temperatures can drop to -3°C. Light snow can occur between January and November.

Temperatures in Sławno vary considerably across the year, with a 23°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 20°C with a mean of 18°C. The coldest month is January, when overnight lows fall to -3°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.

Sławno is a moderately rainy area, receiving approximately 881mm of precipitation annually, which averages out to around 73mm per month. The wettest month is July, averaging 123mm of rainfall. June and August also tend to see above-average precipitation. The driest month is September, with just 28mm. That's 95mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and November, totalling around 27cm annually. January is the snowiest month with approximately 16cm.

Sławno is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months.

It is currently summer in Sławno, which began on June 21, 2026. Sławno is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 20°C, while the coldest stretch bottoms out in January near -3°C. Autumn is next, beginning on September 23, 2026 — 52 days from now.

The best time to visit Sławno is during September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 28mm per month. By contrast, July can be uncomfortably hot with highs reaching 20°C, while January is the coldest period with lows dropping to -3°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Sławno based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.