Climate Insights for Uusikaupunki

The climate in Uusikaupunki is cool. The average annual temperature is 7°C and approximately 638mm of precipitation falls per year. August is the wettest month, receiving around 79mm of rainfall. Uusikaupunki is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, Juli, Juni. The coldest months are Februar, Januar, März, when temperatures can drop to -3°C. Snowfall occurs from January to December, with around 79cm accumulating over the season.

Temperatures in Uusikaupunki vary considerably across the year, with a 21°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 18°C with a mean of 17°C. The coldest month is Februar, when overnight lows fall to -3°C and the daily average is -1°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 6°C shift in average temperatures.

Uusikaupunki is a relatively dry area, receiving approximately 638mm of precipitation annually, which averages out to around 53mm per month. The wettest month is August, averaging 79mm of rainfall. October and November also tend to see above-average precipitation. The driest month is April, with just 29mm. That's 49mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 79cm accumulating over the season. January typically sees the most snow at around 24cm.

Uusikaupunki is moderately windy, with an average annual wind speed of 28km/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 33km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in July, with average winds dropping to 24km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 9km/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 32km/h in winter, 27km/h in spring, 25km/h in summer, 30km/h in autumn.

It is currently winter in Uusikaupunki, which began on December 21, 2026. Uusikaupunki 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 18°C, while the coldest stretch bottoms out in Februar near -3°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Uusikaupunki is during Juli and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 71mm per month. By contrast, Februar can be quite cold with temperatures dropping to -3°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Uusikaupunki 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.