Irkutsk weather in September
Temperature, rain and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: May – August
What is the weather like in Irkutsk in September?
In September, Irkutsk is cool: daytime highs average 16 °C, and nights cool down to about 6 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 46 mm in total. All in all, September is a good month for a holiday in Irkutsk.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 80 | 67 | 34 |
| Day | 22° | 16° | 7° |
| Night | 12° | 6° | −2° |
| Sun | 8 h | 6 h | 5 h |
| Rain days | 11 | 10 | 5 |
More details for September
- Daylight
- 12 h 46 min06:35 – 19:21
- UV index
- 4 · moderateclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 15 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+8Asia/Irkutsk
How the score comes together
- Temperatureweight 50 %78 %
- Sunshineweight 20 %52 %
- Few rainy daysweight 30 %59 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Sunscreen
- A jumper for the evenings
- Rain jacket or umbrella
Irkutsk in September: quick answers
Is Irkutsk hot in September?
No. In September, Irkutsk is cool: daytime highs average 16 °C and nights drop to about 6 °C.
Does it rain much in Irkutsk in September?
Rain is frequent, with about 10 rainy days and 46 mm in total.
Irkutsk month by month
The whole year in IrkutskAll destinations: RussiaWhere to go in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences