Climate Insights for Siilinjärvi

The climate in Siilinjärvi is cool. The average annual temperature is 4°C and approximately 746mm of precipitation falls per year. Siilinjärvi receives a notable amount of rainfall throughout the year, including during its driest month. Siilinjärvi is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: Juli, August, Juni. The coldest months are Januar, Februar, März, when temperatures can drop to -10°C. Snowfall occurs from January to December, with around 177cm accumulating over the season.

Temperatures in Siilinjärvi vary considerably across the year, with a 31°C difference between the coldest and warmest months. Juli is the warmest month, though highs remain moderate at 21°C with a mean of 17°C. The coldest month is Januar, when overnight lows fall to -10°C and the daily average is -8°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between April and May, with a 7°C shift in average temperatures.

Siilinjärvi is a relatively dry area, receiving approximately 746mm of precipitation annually, which averages out to around 62mm per month. The wettest month is July, averaging 101mm of rainfall. August and June also tend to see above-average precipitation. The driest month is March, with just 35mm. That's 65mm 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. Snowfall is a regular feature from January to December, with around 177cm accumulating over the season. December typically sees the most snow at around 36cm.

Siilinjärvi is mildly breezy, with an average annual wind speed of 16km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 17km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 14km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 3km/h between the calmest and windiest months.

It is currently winter in Siilinjärvi, which began on December 21, 2026. Siilinjärvi 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 Juli at around 21°C, while the coldest stretch bottoms out in Januar near -10°C. Spring is next, beginning on March 20, 2026 — 1 days from now.

The best time to visit Siilinjärvi is during Juni and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 82mm per month. By contrast, Juli can be uncomfortably hot with highs reaching 21°C, while Januar is the coldest period with lows dropping to -10°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 Siilinjärvi 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.