Irkutsk Weather & Climate: Best Time to Visit

Visitors to Irkutsk can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a comfortable 25°C (77°F) in July, the warmest time of the year, to a very cold -14°C (7°F) during cooler months like January.

At night, you can expect temperatures ranging from 14°C (57°F) in July to around -24°C (-11°F) during January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Irkutsk tends toward drier weather patterns, receiving approximately 497 mm (20 in) of rain/snow per year. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, August it receives high rainfall, averaging 102 mm (4 in) of precipitation, recorded across 14 rainy days. In contrast, the driest month February brings less snowfall, with 11 mm (0.4 in) over 8 snowy days. For more details, please visit our Irkutsk Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Seasonal changes in sunshine hours are quite dramatic in Irkutsk. While May receives considerable daily sunshine with up to 8.9 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.2 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

The relative humidity is high throughout the year in Irkutsk.

The city experiences its highest humidity in December, reaching 85%. In May, the humidity drops to its lowest level at 55%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year