December in Olympia averages a daily high of 7.3°C with nights around 0.6°C. Expect roughly 20.4 wet days totalling 206.5mm. A hard month to visit for comfort alone.
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 December data.