Irkutsk, Irkutsk Oblast Weather by Month and Climate Averages

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. The sun is out about 39% of daylight hours. 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. The sun is out about 42% of daylight hours. 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. The sun is out about 43% of daylight hours. 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. The sun is out about 41% of daylight hours. 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. The sun is out about 39% of daylight hours. 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. The sun is out about 38% of daylight hours. 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. The sun is out about 33% of daylight hours. 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. The sun is out about 37% of daylight hours. 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. The sun is out about 36% of daylight hours. 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. The sun is out about 48% of daylight hours. 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. The sun is out about 29% of daylight hours. 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. The sun is out about 30% of daylight hours. 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 sunshine about 48% of daylight hours. November is the cloudiest, at 29%. Over the year the sun shines about 38% of daylight hours. 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

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 on record brought 114 mm of rain, 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.

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?

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 sunshine about 48% of daylight hours. 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.