Climate averages 1991–2020
Irkutsk weather
in August.
A warm, wet month: the 3rd warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Irkutsk: daytime highs average 22.2°C and nights cool to about 12.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 101 mm of rain on roughly 12 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 14 h 41 min on an average August day.
The nearest other city in this atlas is Angarsk (39 km away). In August its highs average 22.6°C, about as warm as Irkutsk, with 85 mm of rain.
Among the 236 cities listed in Russia, Irkutsk ranks joint 99th of 236 for the warmest August highs and 223rd of 236 for the driest August (rainfall, lowest first). The mean August high of those 236 cities is 22.4°C; Irkutsk is 0.2°C cooler than that mean.
From August to September, average highs fall by 6.8°C to 15.4°C, and monthly rainfall falls from 101 mm to 61 mm.
The annual picture
August in context
Monthly precipitation
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Irkutsk climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -13.8°C-22.9°C | -22.9°C | 5.5 | 1.9 | 8.38 h |
| February | -8.2°C-20.0°C | -20.0°C | 5.2 | 1.8 | 9.910 h |
| March | 0.2°C-12.0°C | -12.0°C | 10 | 3.4 | 11.812 h |
| April | 9.4°C-2.7°C | -2.7°C | 22 | 5.6 | 13.914 h |
| May | 16.8°C3.3°C | 3.3°C | 38 | 8.9 | 15.716 h |
| June | 22.8°C10.7°C | 10.7°C | 65 | 10.3 | 16.717 h |
| July | 24.6°C14.0°C | 14.0°C | 94 | 12.2 | 16.316 h |
| August, selected | 22.2°C12.4°C | 12.4°C | 101 | 11.6 | 14.715 h |
| September | 15.4°C5.8°C | 5.8°C | 61 | 10.2 | 12.713 h |
| October | 6.9°C-1.8°C | -1.8°C | 23 | 5.7 | 10.711 h |
| November | -3.5°C-11.0°C | -11.0°C | 13 | 4.0 | 8.89 h |
| December | -11.4°C-19.4°C | -19.4°C | 9.5 | 3.5 | 7.88 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Angarsk in AugustRussia · 39 kmHigh 22.6°C · Low 12.5°C · 85 mm rain
- Usol’ye-Sibirskoye in AugustRussia · 67 kmHigh 22.6°C · Low 12.6°C · 86 mm rain
- Ulan-Ude in AugustRussia · 232 kmHigh 23.1°C · Low 12.3°C · 68 mm rain
- Darhan in AugustMongolia · 333 kmHigh 24.6°C · Low 13.4°C · 78 mm rain
- Erdenet in AugustMongolia · 363 kmHigh 20.7°C · Low 11.0°C · 86 mm rain
- Bratsk in AugustRussia · 461 kmHigh 19.3°C · Low 13.3°C · 58 mm rain
- Ulan Bator in AugustMongolia · 522 kmHigh 21.7°C · Low 9.8°C · 68 mm rain
- Chita in AugustRussia · 628 kmHigh 21.9°C · Low 11.6°C · 83 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Irkutsk) is explained once on the Irkutsk year overview and on the Sources, method and limits page.