Helsinki Monthly Climate

Helsinki has a humid continental climate with maritime influences from the Baltic Sea. The city experiences warm summers and cold winters, with significant variations in daylight hours throughout the year. The Gulf Stream helps moderate winter temperatures, while the Baltic Sea influence creates a unique microclimate in the coastal area.

Don't forget to check WhereWeather Website for weather statistics on your exact travel dates, for any city in the world. You can also compare different cities and dates side-by-side.

Temperature Overview

Average Daytime Temperature: 8°C (46°F)
Average Nighttime Temperature: 2°C (36°F)

Rainfall Statistics

Annual average daily rainfall: 1.8 mm (0.071 inches) per day
Rainiest month: August with around 2.8 mm (0.110 inches) per day
Driest month: March with around 1.1 mm (0.043 inches) per day
Average number of rainy days per year: 132 days

Monthly Weather Conditions

Temperature

Precipitation

Seasonal Breakdown

December-February (Winter)

Highs: -2-0°C (28-32°F)
Lows: -7-(-5)°C (19-23°F)
Rainy Days: 9-11 days per month
Average Precipitation: 1.5 mm/day
Cold with frequent snow and very limited daylight

March-May (Spring)

Highs: 3-15°C (37-59°F)
Lows: -4-6°C (25-43°F)
Rainy Days: 9-10 days per month
Average Precipitation: 1.4 mm/day
Gradually warming with rapidly increasing daylight

June-August (Summer)

Highs: 19-22°C (66-72°F)
Lows: 11-13°C (52-55°F)
Rainy Days: 11-13 days per month
Average Precipitation: 2.5 mm/day
Mild with nearly continuous daylight

September-November (Autumn)

Highs: 4-15°C (39-59°F)
Lows: -1-8°C (30-46°F)
Rainy Days: 11-12 days per month
Average Precipitation: 2.2 mm/day
Cooling temperatures with rapidly decreasing daylight

Best Time to Visit

The best time to visit Helsinki is during summer (June to August) when temperatures are mild and daylight hours are extremely long. However, each season offers unique experiences:

Winter (December-February) brings cold temperatures and snow, creating a magical winter wonderland. While daylight hours are very limited, this is perfect for experiencing Finnish winter activities like ice skating, cross-country skiing in Central Park, and enjoying the city's famous sauna culture. The Christmas season and Lux Helsinki light festival illuminate the dark winter days.

Spring (March-May) sees rapidly increasing daylight hours and warming temperatures. This is an excellent time for outdoor activities as nature awakens, particularly during May when the city's numerous parks burst into bloom. The Helsinki Restaurant Day and Vappu (May Day) celebrations are spring highlights.

Summer (June-August) offers pleasant temperatures and nearly continuous daylight around the summer solstice. This is the best time for exploring the Helsinki Archipelago, enjoying outdoor cafes and markets, and participating in numerous festivals. The Flow Festival and Helsinki Festival are major summer events.

Autumn (September-November) brings beautiful fall colors to the city's parks and forests. While temperatures cool and daylight decreases rapidly, this is an ideal time for cultural activities, visiting museums, and experiencing the Finnish tradition of ruska (autumn colors). The Helsinki Design Week in September is a significant autumn event.

Before you go ahead and plan your next visit, make sure to check the weather forecast for your exact travel dates on WhereWeather Website. You can also compare different cities and dates side-by-side.