May in Santee averages a daily high of 24.7°C with nights around 13.2°C. Rain is rare — about 2.4 wet days and 8.4mm across the month. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Santee is March–June.
Based on EL CAJON, CA US (6km), 1995–2024. 28 years of May data.