May in Pleasanton averages a daily high of 24.3°C with nights around 9.9°C. Expect roughly 3 wet days totalling 11.4mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Pleasanton is April–June.
Based on LIVERMORE MUNICIPAL AIRPORT, CA US (6.3km), 1995–2024. 27 years of May data.