May in Billings averages a daily high of 20.8°C with nights around 6°C. Expect roughly 11.2 wet days totalling 66.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Billings is June.
Based on BILLINGS WATER TREATMENT PLANT, MT US (2km), 1995–2024. 28 years of May data.