May in Manteca averages a daily high of 27.8°C with nights around 11.1°C. Rain is rare — about 2.8 wet days and 12.9mm across the month. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Manteca is April–May.
Based on STOCKTON AIRPORT, CA US (10.3km), 1995–2024. 30 years of May data.