Irkutsk weather in September
September in Irkutsk: cool, a little rain, with clean air — a great time to visit.
#5 of 12 months in Irkutsk · #357 of 604 destinations to visit in September · comfort 77/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Irkutsk climate normals — September
| Daytime high | 16°C / 61°F | 🙂 cool |
|---|---|---|
| Nighttime low | 6°C / 44°F | |
| Feels like (high) | 14°C / 57°F | |
| Rainfall | 69 mm / 2.7 in | 🌦 some rain |
| Rainy days | 10 days | |
| Humidity | 72% | 💧 humid |
| Dew point | 6°C / 43°F | |
| Sunshine | 8.5 h/day | |
| Daylight | 12.6 h | |
| Wind | 15 km/h / 9 mph | |
| Snowfall | 0.7 cm / 0.3 in | |
| Air quality (US AQI) | 28 | 🍃 good |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Irkutsk in September — FAQ
- Is September a good time to visit Irkutsk?
- September in Irkutsk: cool, a little rain, with clean air — a great time to visit. It ranks #5 of 12 months for Irkutsk on SeasonMap's comfort score (77/100).
- What is the weather like in Irkutsk in September?
- In September, Irkutsk averages a daily high of 16°C and a low of 6.4°C, with about 68.8 mm of rain over roughly 10.4 rainy days.
- What is the air quality in Irkutsk in September?
- Irkutsk has a mean US Air Quality Index of about 28 in September.