May in Salem averages a daily high of 20.2°C with nights around 7.8°C. Expect roughly 11.6 wet days totalling 56mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Salem is June–September.
Based on SALEM AIRPORT MCNARY FIELD, OR US (5km), 1995–2024. 30 years of May data.