Helsinki, Uusimaa Weather by Month and Climate Averages

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.

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. The sun is out about 16% of daylight hours. 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. The sun is out about 21% of daylight hours. 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. The sun is out about 37% of daylight hours. 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. The sun is out about 44% of daylight hours. 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. The sun is out about 46% of daylight hours. 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. The sun is out about 56% of daylight hours. 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. The sun is out about 41% of daylight hours. 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. The sun is out about 36% of daylight hours. 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. The sun is out about 32% of daylight hours. 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. The sun is out about 24% of daylight hours. 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. The sun is out about 17% of daylight hours. 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. The sun is out about 13% of daylight hours. 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 sunshine about 56% of daylight hours. December is the cloudiest, at 13%. Over the year the sun shines about 32% of daylight hours. 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

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 on record brought 79 mm of rain, 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.

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?

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 sunshine about 56% of daylight hours. 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.