May in Modesto averages a daily high of 27.9°C with nights around 12.4°C. Rain is rare — about 2.9 wet days and 15.2mm across the month. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Modesto is April–May.
Based on MODESTO AIRPORT, CA US (4km), 1995–2024. 30 years of May data.