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Bratsk, 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 Bratsk, Irkutsk Oblast?
Bratsk, Irkutsk Oblast gets 372 mm of precipitation a year over about 162 rainy days. July is the warmest month (average high 24°C) and January the coldest (average low -23°C).
Subarctic climate
Bratsk, Irkutsk Oblast has warm summers and cold winters. Daytime highs range from about -15°C in January to 24°C in July. August is usually the wettest month. The most comfortable time to visit is typically June to July, when daytime highs sit near 23°C.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | -21° | -13° |
| Spring | Mar–May | -5° | 6° |
| Summer | Jun–Aug | 12° | 22° |
| Autumn | Sep–Nov | -3° | 4° |
How much rain does Bratsk get?
Bratsk gets 372 mm of precipitation in an average year, spread over about 162 days with measurable rain. That is more rainy days than 74% of Russia.
August is the wettest month, with 61 mm. March is the driest, with 12 mm. December has the most rainy days, about 20.
The longest dry spell in the last five years lasted 21 days, to February 9, 2024.
Bratsk weather by month
Bratsk weather in January
In January, Bratsk averages a high of -16°C and a low of -23°C. It gets 16 mm of precipitation over about 18 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The January record high is 4°C (1979) and the record low is -46°C (2001).
Bratsk weather in February
In February, Bratsk averages a high of -11°C and a low of -21°C. It gets 12 mm of precipitation over about 14 rainy days. Estimated sunshine is 27% of daylight hours, derived from ERA5 cloud cover. The February record high is 7°C (1987) and the record low is -43°C (2001).
Bratsk weather in March
In March, Bratsk averages a high of -2°C and a low of -13°C. It gets 12 mm of precipitation over about 10 rainy days. Estimated sunshine is 25% of daylight hours, derived from ERA5 cloud cover. The March record high is 14°C (2025) and the record low is -41°C (1971).
Bratsk weather in April
In April, Bratsk averages a high of 6°C and a low of -4°C. It gets 16 mm of precipitation over about 10 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The April record high is 23°C (2022) and the record low is -28°C (1984).
Bratsk weather in May
In May, Bratsk averages a high of 14°C and a low of 3°C. It gets 34 mm of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The May record high is 31°C (2017) and the record low is -10°C (2001).
Bratsk weather in June
In June, Bratsk averages a high of 22°C and a low of 10°C. It gets 51 mm of precipitation over about 11 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The June record high is 33°C (1979) and the record low is -3°C (1992). June is one of the most comfortable months to visit.
Bratsk weather in July
In July, Bratsk averages a high of 24°C and a low of 13°C. It gets 60 mm of precipitation over about 11 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The July record high is 34°C (1993) and the record low is 2°C (1978). July is one of the most comfortable months to visit.
Bratsk weather in August
In August, Bratsk averages a high of 21°C and a low of 11°C. It gets 61 mm of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The August record high is 32°C (2000) and the record low is -2°C (1981).
Bratsk weather in September
In September, Bratsk averages a high of 13°C and a low of 4°C. It gets 39 mm of precipitation over about 13 rainy days. Estimated sunshine is 31% of daylight hours, derived from ERA5 cloud cover. The September record high is 26°C (2007) and the record low is -7°C (1977).
Bratsk weather in October
In October, Bratsk averages a high of 4°C and a low of -2°C. It gets 24 mm of precipitation over about 14 rainy days. Estimated sunshine is 26% of daylight hours, derived from ERA5 cloud cover. The October record high is 22°C (1986) and the record low is -24°C (1974).
Bratsk weather in November
In November, Bratsk averages a high of -6°C and a low of -12°C. It gets 26 mm of precipitation over about 19 rainy days. Estimated sunshine is 19% of daylight hours, derived from ERA5 cloud cover. The November record high is 12°C (1978) and the record low is -36°C (1997).
Bratsk weather in December
In December, Bratsk averages a high of -13°C and a low of -20°C. It gets 22 mm of precipitation over about 20 rainy days. Estimated sunshine is 13% of daylight hours, derived from ERA5 cloud cover. The December record high is 5°C (2013) and the record low is -43°C (1976).
Sunshine, humidity and wind in Bratsk
June is the sunniest month in Bratsk, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. December is the cloudiest, at 13%. The annual cloud-cover estimate is 29% of daylight hours; it is not a measurement of sunshine duration. Bratsk is cloudier than 67% of Russia.
Humidity peaks in November at 77% and is lowest in May at 53%.
Bratsk has about 2 days a year above 32°C. Bratsk is cooler than 94% of Russia.
First and last freeze in Bratsk
The first fall freeze in Bratsk typically comes around September 19, and the last spring freeze around May 21. That leaves a frost-free growing season of about 121 days.
Bratsk weather records
These records cover BRATSK during 1970–2025. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Bratsk station is 34°C, on July 31, 1993. The coldest is -46°C, on January 7, 2001.
The wettest day in the available station history brought 65 mm of precipitation, on September 2, 1987.
42 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°C per decade since 1971.
The best time to visit Bratsk
The most comfortable time to visit is typically June to July, when daytime highs sit near 23°C.
Winter (December–February) is cold, with average highs around -13°C and lows near -21°C.
Spring (March–May) is chilly, with average highs around 6°C and lows near -5°C.
Summer (June–August) is warm, with average highs around 22°C and lows near 12°C. It can feel humid.
Autumn (September–November) is cold, with average highs around 4°C and lows near -3°C.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|
| January | -23° | -16° | 16 mm | 18 | 76% | 19% | 4° | -46° |
| February | -21° | -11° | 12 mm | 14 | 74% | 27% | 7° | -43° |
| March | -13° | -2° | 12 mm | 10 | 66% | 25% | 14° | -41° |
| April | -4° | 6° | 16 mm | 10 | 56% | 36% | 23° | -28° |
| May | 3° | 14° | 34 mm | 12 | 53% | 38% | 31° | -10° |
| June | 10° | 22° | 51 mm | 11 | 63% | 40% | 33° | -3° |
| July | 13° | 24° | 60 mm | 11 | 69% | 38% | 34° | 2° |
| August | 11° | 21° | 61 mm | 12 | 74% | 39% | 32° | -2° |
| September | 4° | 13° | 39 mm | 13 | 75% | 31% | 26° | -7° |
| October | -2° | 4° | 24 mm | 14 | 73% | 26% | 22° | -24° |
| November | -12° | -6° | 26 mm | 19 | 77% | 19% | 12° | -36° |
| December | -20° | -13° | 22 mm | 20 | 77% | 13% | 5° | -43° |
Station: BRATSK, 18 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.
Bratsk climate questions
How much rain does Bratsk get?
Bratsk gets 372 mm of precipitation in an average year, over about 162 rainy days.
What is the wettest month in Bratsk?
August is the wettest month in Bratsk, with 61 mm. March is the driest, with 12 mm.
How many rainy days does Bratsk have a year?
Bratsk has about 162 days with measurable rain in an average year. December has the most, about 20.
What is the hottest month in Bratsk?
July is the warmest month in Bratsk, with an average high of 24°C.
What is the coldest month in Bratsk?
January is the coldest month in Bratsk, with an average low of -23°C.
What is the record high temperature in Bratsk?
Within the available 1970–2025 station history, the record high at the Bratsk station is 34°C, set on July 31, 1993. The record low is -46°C, on January 7, 2001.
What is the sunniest month in Bratsk?
June is the sunniest month in Bratsk, with estimated sunshine of 40% of daylight hours from ERA5 cloud cover. December is the cloudiest.
When is the first frost in Bratsk?
The first fall freeze in Bratsk typically comes around September 19. The last spring freeze is around May 21.
What is the best time to visit Bratsk?
The most comfortable time to visit is typically June to July, when daytime highs sit near 23°C.