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Helsinki, Uusimaa Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Helsinki, Uusimaa?
Helsinki, Uusimaa gets 653 mm of precipitation a year over about 159 rainy days. July is the warmest month (average high 22°C) and February the coldest (average low -6°C).
Humid continental climate
Helsinki, Uusimaa has warm summers and cold winters. Daytime highs range from about -1°C in February to 22°C in July. August is usually the wettest month. The most comfortable time to visit is typically June to July, when daytime highs sit near 20°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -5° | 0° |
| Spring | Mar–May | 1° | 8° |
| Summer | Jun–Aug | 13° | 21° |
| Autumn | Sep–Nov | 4° | 9° |
How much rain does Helsinki get?
Helsinki gets 653 mm of precipitation in an average year, spread over about 159 days with measurable rain. That is fewer rainy days than 67% of Finland.
August is the wettest month, with 82 mm. April is the driest, with 34 mm. January has the most rainy days, about 17.
The longest dry spell in the last five years lasted 27 days, to April 23, 2023.
From October 2025 to September 2026 Helsinki got 477 mm of rain, against a normal of 653 mm for those months. June 2026 had the most, with 83 mm.
Helsinki weather by month
Helsinki weather in January
In January, Helsinki averages a high of -1°C and a low of -6°C. It gets 53 mm of precipitation over about 17 rainy days. Estimated sunshine is 16% of daylight hours, derived from ERA5 cloud cover. The January record high is 8°C (1973) and the record low is -34°C (1987).
Helsinki weather in February
In February, Helsinki averages a high of -1°C and a low of -6°C. It gets 38 mm of precipitation over about 14 rainy days. Estimated sunshine is 21% of daylight hours, derived from ERA5 cloud cover. The February record high is 10°C (1998) and the record low is -26°C (2012).
Helsinki weather in March
In March, Helsinki averages a high of 2°C and a low of -3°C. It gets 34 mm of precipitation over about 12 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The March record high is 15°C (2007) and the record low is -21°C (1987).
Helsinki weather in April
In April, Helsinki averages a high of 8°C and a low of 1°C. It gets 34 mm of precipitation over about 11 rainy days. Estimated sunshine is 44% of daylight hours, derived from ERA5 cloud cover. The April record high is 22°C (2000) and the record low is -11°C (1998).
Helsinki weather in May
In May, Helsinki averages a high of 14°C and a low of 7°C. It gets 38 mm of precipitation over about 10 rainy days. Estimated sunshine is 46% of daylight hours, derived from ERA5 cloud cover. The May record high is 28°C (2018) and the record low is -3°C (1999).
Helsinki weather in June
In June, Helsinki averages a high of 19°C and a low of 11°C. It gets 60 mm of precipitation over about 13 rainy days. Estimated sunshine is 56% of daylight hours, derived from ERA5 cloud cover. The June record high is 31°C (1972) and the record low is 1°C (2000). June is one of the most comfortable months to visit.
Helsinki weather in July
In July, Helsinki averages a high of 22°C and a low of 14°C. It gets 57 mm of precipitation over about 11 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The July record high is 33°C (2019) and the record low is 7°C (1987). July is one of the most comfortable months to visit.
Helsinki weather in August
In August, Helsinki averages a high of 21°C and a low of 13°C. It gets 82 mm of precipitation over about 13 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The August record high is 31°C (1975) and the record low is 3°C (1973).
Helsinki weather in September
In September, Helsinki averages a high of 16°C and a low of 9°C. It gets 56 mm of precipitation over about 12 rainy days. Estimated sunshine is 32% of daylight hours, derived from ERA5 cloud cover. The September record high is 26°C (2024) and the record low is -4°C (1986).
Helsinki weather in October
In October, Helsinki averages a high of 9°C and a low of 4°C. It gets 73 mm of precipitation over about 15 rainy days. Estimated sunshine is 24% of daylight hours, derived from ERA5 cloud cover. The October record high is 18°C (2005) and the record low is -12°C (1992).
Helsinki weather in November
In November, Helsinki averages a high of 4°C and a low of 1°C. It gets 69 mm of precipitation over about 16 rainy days. Estimated sunshine is 17% of daylight hours, derived from ERA5 cloud cover. The November record high is 14°C (2022) and the record low is -18°C (1980).
Helsinki weather in December
In December, Helsinki averages a high of 1°C and a low of -3°C. It gets 58 mm of precipitation over about 17 rainy days. Estimated sunshine is 13% of daylight hours, derived from ERA5 cloud cover. The December record high is 11°C (2015) and the record low is -29°C (1978).
Sunshine, humidity and wind in Helsinki
June is the sunniest month in Helsinki, with estimated sunshine of 56% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 13%. The annual cloud-cover estimate is 32% of daylight hours; it is not a measurement of sunshine duration. Helsinki is sunnier than 84% of Finland.
Humidity peaks in January at 90% and is lowest in May at 61%.
First and last freeze in Helsinki
The first fall freeze in Helsinki typically comes around October 13, and the last spring freeze around April 29. That leaves a frost-free growing season of about 167 days.
Helsinki weather records
These records cover HELSINKI KAISANIEMI AWS during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Helsinki station is 33°C, on July 28, 2019. The coldest is -34°C, on January 10, 1987.
The wettest day in the available station history brought 79 mm of precipitation, on July 24, 1993.
48 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.5°C per decade since 1970.
The best time to visit Helsinki
The most comfortable time to visit is typically June to July, when daytime highs sit near 20°C.
Winter (December–February) is cold, with average highs around 0°C and lows near -5°C.
Spring (March–May) is chilly, with average highs around 8°C and lows near 1°C.
Summer (June–August) is warm, with average highs around 20°C and lows near 13°C. It can feel humid.
Autumn (September–November) is chilly, with average highs around 10°C and lows near 5°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -6° | -1° | 53 mm | 17 | 90% | 16% | 8° | -34° |
| February | -6° | -1° | 38 mm | 14 | 87% | 21% | 10° | -26° |
| March | -3° | 2° | 34 mm | 12 | 81% | 37% | 15° | -21° |
| April | 1° | 8° | 34 mm | 11 | 69% | 44% | 22° | -11° |
| May | 7° | 14° | 38 mm | 10 | 61% | 46% | 28° | -3° |
| June | 11° | 19° | 60 mm | 13 | 64% | 56% | 31° | 1° |
| July | 14° | 22° | 57 mm | 11 | 73% | 41% | 33° | 7° |
| August | 13° | 21° | 82 mm | 13 | 79% | 36% | 31° | 3° |
| September | 9° | 16° | 56 mm | 12 | 82% | 32% | 26° | -4° |
| October | 4° | 9° | 73 mm | 15 | 86% | 24% | 18° | -12° |
| November | 1° | 4° | 69 mm | 16 | 90% | 17% | 14° | -18° |
| December | -3° | 1° | 58 mm | 17 | 90% | 13% | 11° | -29° |
Station: HELSINKI KAISANIEMI AWS, 1 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Helsinki climate questions
How much rain does Helsinki get?
Helsinki gets 653 mm of precipitation in an average year, over about 159 rainy days.
What is the wettest month in Helsinki?
August is the wettest month in Helsinki, with 82 mm. April is the driest, with 34 mm.
How many rainy days does Helsinki have a year?
Helsinki has about 159 days with measurable rain in an average year. January has the most, about 17.
What is the hottest month in Helsinki?
July is the warmest month in Helsinki, with an average high of 22°C.
What is the coldest month in Helsinki?
February is the coldest month in Helsinki, with an average low of -6°C.
What is the record high temperature in Helsinki?
Within the available 1970–2026 station history, the record high at the Helsinki station is 33°C, set on July 28, 2019. The record low is -34°C, on January 10, 1987.
What is the sunniest month in Helsinki?
June is the sunniest month in Helsinki, with estimated sunshine of 56% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Helsinki?
The first fall freeze in Helsinki typically comes around October 13. The last spring freeze is around April 29.
What is the best time to visit Helsinki?
The most comfortable time to visit is typically June to July, when daytime highs sit near 20°C.