Irkutsk Weather in September
Irkutsk in September sees moderate daytime temperatures of 17°C (63°F) and nighttime lows of 6°C (43°F). Rainfall is fairly high this month at around 66 mm (2.6 in), so pack a rain jacket to stay dry.
Rainfall in Irkutsk in September
Looking at the last 30 years, the data shows about 11 days with rain, averaging 66 mm (2.6 in) for the month. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.
Temperature in Irkutsk in September
September in Irkutsk brings moderate temperatures, with highs of 17°C (63°F) and nights around 6°C (43°F). Conditions are often most pleasant around the middle of the day. At 6°C (43°F) overnight, it gets properly cold after dark. On the bright side, cold nights tend to make for excellent sleeping conditions.
Sunshine in Irkutsk in September
The month experiences a moderate amount of sunlight, with 185 hours of sunshine. This provides a nice balance between sunshine and clouds.For Irkutsk itself, June and July generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Russia, check out our Irkutsk's climate page.
Irkutsk Temperature in September
Min Temperature
6°C (43°F)
Max Temperature
17°C (63°F)
Chance of Rain
36%
Precipitation
66 mm (2.6 in)
Rainy days
11 days
Humidity
74%
Sunshine
185 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Irkutsk typically drop from around 18°C (64°F) at the start of September to approximately 12°C (54°F) by the end. Nights are cold, with lows typically ranging from 0°C (32°F) to 8°C (46°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Irkutsk in September
Browse day-by-day weather records for Irkutsk spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Irkutsk historical weather extremes in September
The extremes listed below come from historical weather data collected in Irkutsk from 1976 through 2025.
- Irkutsk recorded its highest September temperature of 31°C (88°F) on September 13, 2015.
- Nighttime temperatures dropped to -10°C (14°F) on September 28, 2014, marking the coldest September night on record.
Best Places in Russia in September
Find out more about the weather in Russia and which places have the best travel conditions in this month. See all of Russia in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Irkutsk in September
Pleasant temperatures in September mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Rain gear is recommended, you can expect wet weather on multiple days. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Irkutsk in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Russia, check out our Irkutsk's climate page.
Temperature Rainfall Sunshine Humidity
See the full Irkutsk climate overview or explore weather in Russia.
