September
Best time
15.3°C / 6°C
14 rain days
cool, rainy
Best time to visit Irkutsk
Irkutsk, Russia — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. The standouts: September.
Best months to visit
OK — shoulder months
June
OK
23.6°C / 10.8°C
16 rain days
warm, very wet
- comfortable temperatures (avg high 23.6°C / 74°F)
August
OK
22.4°C / 12.6°C
16 rain days
warm, very wet
- comfortable temperatures (avg high 22.4°C / 72°F)
July
OK
24.9°C / 14°C
17 rain days
warm, very wet
- comfortable temperatures (avg high 24.9°C / 77°F)
- warm evenings without humidity overload
May
OK
16.6°C / 3.4°C
16 rain days
mild, very wet
April
OK
10.8°C / -2.1°C
13 rain days
cool, freezing nights, rainy
October
OK
7°C / -1.9°C
11 rain days
chilly, freezing nights, rainy
Months to skip
March
Skip
1.1°C / -10.7°C
9 rain days
cold, freezing nights
- bitterly cold (overnight -10.7°C)
November
Skip
-4.3°C / -12.4°C
11 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -12.4°C)
February
Skip
-9.8°C / -20.1°C
9 rain days
cold, freezing nights
- bitterly cold (overnight -20.1°C)
December
Skip
-12.3°C / -20.3°C
11 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -20.3°C)
January
Skip
-14.5°C / -22.8°C
10 rain days
cold, freezing nights, rainy
- bitterly cold (overnight -22.8°C)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.