May in Olympia averages a daily high of 18.9°C with nights around 6°C. Expect roughly 11.4 wet days totalling 57.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Olympia is July–August.
Based on OLYMPIA AIRPORT, WA US (7.9km), 1995–2024. 30 years of May data.