Climate Insights for Jastarnia

The climate in Jastarnia is cool. The average annual temperature is 10°C and approximately 747mm of precipitation falls per year. October is the wettest month, receiving around 90mm of rainfall. Jastarnia is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, March, when temperatures can drop to 1°C. Light snow can occur between January and December.

Jastarnia sees moderate temperature variation throughout the year, ranging from 1°C to 21°C. August is the warmest month, though highs remain moderate at 21°C with a mean of 19°C. January is the coolest month, with minimum temperatures around 1°C and an average of 2°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between May and June, with a 5°C shift in average temperatures.

Jastarnia is a relatively dry area, receiving approximately 747mm of precipitation annually, which averages out to around 62mm per month. The wettest month is October, averaging 90mm of rainfall. July and November also tend to see above-average precipitation. The driest month is April, with just 29mm. That's 61mm less than October, 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 December, totalling around 32cm annually. January is the snowiest month with approximately 12cm.

Jastarnia is very windy, with an average annual wind speed of 31km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 36km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in June, with average winds dropping to 26km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 10km/h between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 35km/h in winter, 29km/h in spring, 26km/h in summer, 32km/h in autumn.

It is currently spring in Jastarnia, which began on March 20, 2026. Jastarnia 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 August at around 21°C, while the coldest stretch bottoms out in January near 1°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Jastarnia is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 68mm per month. By contrast, January can be quite cold with temperatures dropping to 1°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Jastarnia 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.