May in Richmond averages a daily high of 20.7°C with nights around 11.2°C. Expect roughly 3.5 wet days totalling 22.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Richmond is May–October.
Based on RICHMOND, CA US (3.2km), 1995–2024. 18 years of May data.