May in Spokane averages a daily high of 19.5°C with nights around 6.9°C. Expect roughly 9.5 wet days totalling 38.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Spokane is June–September.
Based on SPOKANE INTERNATIONAL AIRPORT, WA US (8.5km), 1995–2024. 30 years of May data.