Climate averages 1991–2020
Irkutsk weather
in October.
A cold, fairly dry month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a cold month in Irkutsk: daytime highs average 6.9°C and nights cool to about -1.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 23 mm of rain on roughly 6 days, which makes October a fairly dry month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 10 h 41 min on an average October day.
The nearest other city in this atlas is Angarsk (39 km away). In October its highs average 6.6°C, about as warm as Irkutsk, with 18 mm of rain.
Among the 236 cities listed in Russia, Irkutsk ranks joint 166th of 236 for the warmest October highs and 8th of 236 for the driest October (rainfall, lowest first). The mean October high of those 236 cities is 8.6°C; Irkutsk is 1.7°C cooler than that mean.
From October to November, average highs fall by 10.3°C to -3.5°C, and monthly precipitation falls from 23 mm to 13 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Angarsk in OctoberRussia · 39 kmHigh 6.6°C · Low -2.4°C · 18 mm rain
- Usol’ye-Sibirskoye in OctoberRussia · 67 kmHigh 6.4°C · Low -2.5°C · 18 mm rain
- Ulan-Ude in OctoberRussia · 232 kmHigh 6.3°C · Low -2.6°C · 14 mm rain
- Darhan in OctoberMongolia · 333 kmHigh 8.6°C · Low -2.3°C · 18 mm rain
- Erdenet in OctoberMongolia · 363 kmHigh 6.3°C · Low -3.4°C · 17 mm rain
- Bratsk in OctoberRussia · 461 kmHigh 3.6°C · Low -0.9°C · 27 mm rain
- Ulan Bator in OctoberMongolia · 522 kmHigh 6.5°C · Low -4.1°C · 15 mm rain
- Chita in OctoberRussia · 628 kmHigh 5.2°C · Low -3.9°C · 12 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.