May in Omsk averages a daily high of 19.3°C with nights around 6.5°C. Expect roughly 9.7 wet days totalling 33.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Omsk is May–September.
Based on OMSK, RS (2.9km), 1995–2024. 25 years of May data.