May in Hailar averages a daily high of 18.9°C with nights around 4.6°C. Expect roughly 5.8 wet days totalling 22.9mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Hailar is May–June.
Based on HAILAR, CH (5.6km), 1995–2024. 22 years of May data.