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Irkutsk, Irkutsk Oblast Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Irkutsk, Irkutsk Oblast?
Irkutsk, Irkutsk Oblast gets 475 mm of precipitation a year over about 125 rainy days. July is the warmest month (average high 26°C) and January the coldest (average low -22°C).
Humid continental climate
Irkutsk, Irkutsk Oblast has warm summers and cold winters. Daytime highs range from about -13°C in January to 26°C in July. July is usually the wettest month. The most comfortable time to visit is typically May to June and August, when daytime highs sit near 22°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -20° | -11° |
| Spring | Mar–May | -3° | 10° |
| Summer | Jun–Aug | 12° | 24° |
| Autumn | Sep–Nov | -3° | 7° |
How much rain does Irkutsk get?
Irkutsk gets 475 mm of precipitation in an average year, spread over about 125 days with measurable rain. That is fewer rainy days than 55% of Russia.
July is the wettest month, with 106 mm. February is the driest, with 9 mm. December has the most rainy days, about 14.
The longest dry spell in the last five years lasted 19 days, to April 2, 2022.
Irkutsk weather by month
Irkutsk weather in January
In January, Irkutsk averages a high of -13°C and a low of -22°C. It gets 14 mm of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The January record high is 2°C (1979) and the record low is -43°C (2001).
Irkutsk weather in February
In February, Irkutsk averages a high of -7°C and a low of -19°C. It gets 9 mm of precipitation over about 8 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The February record high is 10°C (1987) and the record low is -41°C (2006).
Irkutsk weather in March
In March, Irkutsk averages a high of 1°C and a low of -11°C. It gets 12 mm of precipitation over about 7 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The March record high is 21°C (2023) and the record low is -35°C (1971).
Irkutsk weather in April
In April, Irkutsk averages a high of 11°C and a low of -2°C. It gets 21 mm of precipitation over about 7 rainy days. Estimated sunshine is 41% of daylight hours, derived from ERA5 cloud cover. The April record high is 29°C (2018) and the record low is -26°C (1984).
Irkutsk weather in May
In May, Irkutsk averages a high of 18°C and a low of 4°C. It gets 36 mm of precipitation over about 9 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The May record high is 34°C (1990) and the record low is -6°C (1979). May is one of the most comfortable months to visit.
Irkutsk weather in June
In June, Irkutsk averages a high of 24°C and a low of 10°C. It gets 69 mm of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The June record high is 36°C (2010) and the record low is -2°C (1992). June is one of the most comfortable months to visit.
Irkutsk weather in July
In July, Irkutsk averages a high of 26°C and a low of 13°C. It gets 106 mm of precipitation over about 13 rainy days. Estimated sunshine is 33% of daylight hours, derived from ERA5 cloud cover. The July record high is 36°C (2002) and the record low is 3°C (1988).
Irkutsk weather in August
In August, Irkutsk averages a high of 23°C and a low of 11°C. It gets 95 mm of precipitation over about 12 rainy days. Estimated sunshine is 37% of daylight hours, derived from ERA5 cloud cover. The August record high is 34°C (2015) and the record low is -1°C (2017). August is one of the most comfortable months to visit.
Irkutsk weather in September
In September, Irkutsk averages a high of 16°C and a low of 4°C. It gets 52 mm of precipitation over about 11 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The September record high is 29°C (2015) and the record low is -9°C (1971).
Irkutsk weather in October
In October, Irkutsk averages a high of 8°C and a low of -2°C. It gets 21 mm of precipitation over about 8 rainy days. Estimated sunshine is 48% of daylight hours, derived from ERA5 cloud cover. The October record high is 24°C (2018) and the record low is -23°C (1976).
Irkutsk weather in November
In November, Irkutsk averages a high of -3°C and a low of -12°C. It gets 20 mm of precipitation over about 12 rainy days. Estimated sunshine is 29% of daylight hours, derived from ERA5 cloud cover. The November record high is 14°C (2013) and the record low is -33°C (1970).
Irkutsk weather in December
In December, Irkutsk averages a high of -11°C and a low of -19°C. It gets 19 mm of precipitation over about 14 rainy days. Estimated sunshine is 30% of daylight hours, derived from ERA5 cloud cover. The December record high is 6°C (2013) and the record low is -41°C (1979).
Sunshine, humidity and wind in Irkutsk
October is the sunniest month in Irkutsk, with estimated sunshine of 48% of daylight hours from ERA5 cloud cover. November is the cloudiest, at 29%. The annual cloud-cover estimate is 38% of daylight hours; it is not a measurement of sunshine duration. Irkutsk is sunnier than 72% of Russia.
Humidity peaks in November at 84% and is lowest in May at 53%.
Irkutsk has about 2 days a year above 32°C. Irkutsk is cooler than 80% of Russia.
First and last freeze in Irkutsk
The first fall freeze in Irkutsk typically comes around September 22, and the last spring freeze around May 19. That leaves a frost-free growing season of about 126 days.
Irkutsk weather records
These records cover IRKUTSK during 1970–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Irkutsk station is 36°C, on June 22, 2010. The coldest is -43°C, on January 8, 2001.
The wettest day in the available station history brought 114 mm of precipitation, on June 28, 1994.
48 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°C per decade since 1970.
The best time to visit Irkutsk
The most comfortable time to visit is typically May to June and August, when daytime highs sit near 22°C.
Winter (December–February) is cold, with average highs around -10°C and lows near -20°C.
Spring (March–May) is chilly, with average highs around 10°C and lows near -3°C.
Summer (June–August) is warm, with average highs around 24°C and lows near 12°C. It can feel humid.
Autumn (September–November) is chilly, with average highs around 7°C and lows near -3°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -22° | -13° | 14 mm | 12 | 75% | 39% | 2° | -43° |
| February | -19° | -7° | 9.4 mm | 8 | 72% | 42% | 10° | -41° |
| March | -11° | 1° | 12 mm | 7 | 64% | 43% | 21° | -35° |
| April | -2° | 11° | 21 mm | 7 | 55% | 41% | 29° | -26° |
| May | 4° | 18° | 36 mm | 9 | 53% | 39% | 34° | -6° |
| June | 10° | 24° | 69 mm | 12 | 66% | 38% | 36° | -2° |
| July | 13° | 26° | 106 mm | 13 | 73% | 33% | 36° | 3° |
| August | 11° | 23° | 95 mm | 12 | 77% | 37% | 34° | -1° |
| September | 4° | 16° | 52 mm | 11 | 76% | 36% | 29° | -9° |
| October | -2° | 8° | 21 mm | 8 | 76% | 48% | 24° | -23° |
| November | -12° | -3° | 20 mm | 12 | 84% | 29% | 14° | -33° |
| December | -19° | -11° | 19 mm | 14 | 81% | 30% | 6° | -41° |
Station: IRKUTSK, 5 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2025; 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.
Irkutsk climate questions
How much rain does Irkutsk get?
Irkutsk gets 475 mm of precipitation in an average year, over about 125 rainy days.
What is the wettest month in Irkutsk?
July is the wettest month in Irkutsk, with 106 mm. February is the driest, with 9 mm.
How many rainy days does Irkutsk have a year?
Irkutsk has about 125 days with measurable rain in an average year. December has the most, about 14.
What is the hottest month in Irkutsk?
July is the warmest month in Irkutsk, with an average high of 26°C.
What is the coldest month in Irkutsk?
January is the coldest month in Irkutsk, with an average low of -22°C.
What is the record high temperature in Irkutsk?
Within the available 1970–2025 station history, the record high at the Irkutsk station is 36°C, set on June 22, 2010. The record low is -43°C, on January 8, 2001.
What is the sunniest month in Irkutsk?
October is the sunniest month in Irkutsk, with estimated sunshine of 48% of daylight hours from ERA5 cloud cover. November is the cloudiest.
When is the first frost in Irkutsk?
The first fall freeze in Irkutsk typically comes around September 22. The last spring freeze is around May 19.
What is the best time to visit Irkutsk?
The most comfortable time to visit is typically May to June and August, when daytime highs sit near 22°C.