Lahti, Paijat-Hame Weather by Month and Climate Averages

How much rain does Lahti get?

Lahti gets 614 mm of precipitation in an average year, spread over about 174 days with measurable rain. That is more rainy days than 64% of Finland.

July is the wettest month, with 71 mm. April is the driest, with 30 mm. December has the most rainy days, about 19.

The longest dry spell in the last five years lasted 26 days, to April 23, 2023.

Lahti weather by month

Lahti weather in January

In January, Lahti averages a high of -3°C and a low of -9°C. It gets 45 mm of precipitation over about 18 rainy days. The sun is out about 14% of daylight hours. The January record high is 8°C (2020) and the record low is -38°C (1987).

Lahti weather in February

In February, Lahti averages a high of -3°C and a low of -9°C. It gets 36 mm of precipitation over about 14 rainy days. The sun is out about 18% of daylight hours. The February record high is 9°C (1990) and the record low is -33°C (1979).

Lahti weather in March

In March, Lahti averages a high of 2°C and a low of -6°C. It gets 33 mm of precipitation over about 13 rainy days. The sun is out about 33% of daylight hours. The March record high is 16°C (2007) and the record low is -27°C (1981).

Lahti weather in April

In April, Lahti averages a high of 9°C and a low of -1°C. It gets 30 mm of precipitation over about 11 rainy days. The sun is out about 40% of daylight hours. The April record high is 24°C (1998) and the record low is -16°C (1998).

Lahti weather in May

In May, Lahti averages a high of 16°C and a low of 5°C. It gets 43 mm of precipitation over about 11 rainy days. The sun is out about 43% of daylight hours. The May record high is 31°C (2014) and the record low is -6°C (1971).

Lahti weather in June

In June, Lahti averages a high of 20°C and a low of 10°C. It gets 66 mm of precipitation over about 13 rainy days. The sun is out about 52% of daylight hours. The June record high is 33°C (2021) and the record low is -1°C (2017). June is one of the most comfortable months to visit.

Lahti weather in July

In July, Lahti averages a high of 23°C and a low of 13°C. It gets 71 mm of precipitation over about 14 rainy days. The sun is out about 37% of daylight hours. The July record high is 35°C (2010) and the record low is 3°C (1987).

Lahti weather in August

In August, Lahti averages a high of 21°C and a low of 12°C. It gets 67 mm of precipitation over about 13 rainy days. The sun is out about 35% of daylight hours. The August record high is 34°C (2010) and the record low is 1°C (1999). August is one of the most comfortable months to visit.

Lahti weather in September

In September, Lahti averages a high of 14°C and a low of 7°C. It gets 51 mm of precipitation over about 13 rainy days. The sun is out about 26% of daylight hours. The September record high is 28°C (2024) and the record low is -6°C (1976).

Lahti weather in October

In October, Lahti averages a high of 8°C and a low of 2°C. It gets 65 mm of precipitation over about 17 rainy days. The sun is out about 19% of daylight hours. The October record high is 19°C (2018) and the record low is -14°C (2002).

Lahti weather in November

In November, Lahti averages a high of 2°C and a low of -2°C. It gets 56 mm of precipitation over about 18 rainy days. The sun is out about 12% of daylight hours. The November record high is 13°C (2022) and the record low is -21°C (1990).

Lahti weather in December

In December, Lahti averages a high of -1°C and a low of -6°C. It gets 50 mm of precipitation over about 19 rainy days. The sun is out about 11% of daylight hours. The December record high is 11°C (2015) and the record low is -33°C (1978).

Sunshine, humidity and wind in Lahti

June is the sunniest month in Lahti, with sunshine about 52% of daylight hours. December is the cloudiest, at 11%. Over the year the sun shines about 28% of daylight hours. Lahti is sunnier than 57% of Finland.

Humidity peaks in December at 92% and is lowest in May at 58%.

First and last freeze in Lahti

The first fall freeze in Lahti typically comes around September 25, and the last spring freeze around May 16. That leaves a frost-free growing season of about 132 days.

Lahti weather records

The hottest temperature on record at the Lahti station is 35°C, on July 28, 2010. The coldest is -38°C, on January 12, 1987.

The wettest day on record brought 70 mm of rain, on July 27, 1979.

52 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 Lahti

The most comfortable time to visit is typically June and August, when daytime highs sit near 20°C.

Winter (December–February) is cold, with average highs around -2°C and lows near -8°C.

Spring (March–May) is chilly, with average highs around 9°C and lows near -1°C.

Summer (June–August) is warm, with average highs around 21°C and lows near 11°C. It can feel humid.

Autumn (September–November) is chilly, with average highs around 8°C and lows near 3°C.

Lahti climate questions

How much rain does Lahti get?

Lahti gets 614 mm of precipitation in an average year, over about 174 rainy days.

What is the wettest month in Lahti?

July is the wettest month in Lahti, with 71 mm. April is the driest, with 30 mm.

How many rainy days does Lahti have a year?

Lahti has about 174 days with measurable rain in an average year. December has the most, about 19.

What is the hottest month in Lahti?

July is the warmest month in Lahti, with an average high of 23°C.

What is the coldest month in Lahti?

February is the coldest month in Lahti, with an average low of -9°C.

What is the record high temperature in Lahti?

The record high at the Lahti station is 35°C, set on July 28, 2010. The record low is -38°C, on January 12, 1987.

What is the sunniest month in Lahti?

June is the sunniest month in Lahti, with sunshine about 52% of daylight hours. December is the cloudiest.

When is the first frost in Lahti?

The first fall freeze in Lahti typically comes around September 25. The last spring freeze is around May 16.

What is the best time to visit Lahti?

The most comfortable time to visit is typically June and August, when daytime highs sit near 20°C.