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Lahti, Paijat-Hame Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Lahti, Paijat-Hame?
Lahti, Paijat-Hame gets 614 mm of precipitation a year over about 174 rainy days. July is the warmest month (average high 23°C) and February the coldest (average low -9°C).
Humid continental climate
Lahti, Paijat-Hame has warm summers and cold winters. Daytime highs range from about -3°C in January to 23°C in July. July is usually the wettest month. The most comfortable time to visit is typically June and August, when daytime highs sit near 20°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -8° | -2° |
| Spring | Mar–May | -1° | 9° |
| Summer | Jun–Aug | 11° | 21° |
| Autumn | Sep–Nov | 3° | 8° |
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.
From October 2025 to September 2026 Lahti got 530 mm of rain, against a normal of 614 mm for those months. September 2026 had the most, with 85 mm.
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. Estimated sunshine is 14% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 18% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 52% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 35% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 12% of daylight hours, derived from ERA5 cloud cover. 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. Estimated sunshine is 11% of daylight hours, derived from ERA5 cloud cover. 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 estimated sunshine of 52% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 11%. The annual cloud-cover estimate is 28% of daylight hours; it is not a measurement of sunshine duration. 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
These records cover HEINOLA ASEMANTAUS during 1970–2026. Earlier records or other stations in the city may differ.
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 in the available station history brought 70 mm of precipitation, 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.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -9° | -3° | 45 mm | 18 | 91% | 14% | 8° | -38° |
| February | -9° | -3° | 36 mm | 14 | 88% | 18% | 9° | -33° |
| March | -6° | 2° | 33 mm | 13 | 78% | 33% | 16° | -27° |
| April | -1° | 9° | 30 mm | 11 | 66% | 40% | 24° | -16° |
| May | 5° | 16° | 43 mm | 11 | 58% | 43% | 31° | -6° |
| June | 10° | 20° | 66 mm | 13 | 63% | 52% | 33° | -1° |
| July | 13° | 23° | 71 mm | 14 | 72% | 37% | 35° | 3° |
| August | 12° | 21° | 67 mm | 13 | 77% | 35% | 34° | 1° |
| September | 7° | 14° | 51 mm | 13 | 83% | 26% | 28° | -6° |
| October | 2° | 8° | 65 mm | 17 | 87% | 19% | 19° | -14° |
| November | -2° | 2° | 56 mm | 18 | 91% | 12% | 13° | -21° |
| December | -6° | -1° | 50 mm | 19 | 92% | 11% | 11° | -33° |
Station: HEINOLA ASEMANTAUS, 32 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.
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?
Within the available 1970–2026 station history, 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 estimated sunshine of 52% of daylight hours from ERA5 cloud cover. 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.