December in Moreno Valley averages a daily high of 18.4°C with nights around 3°C. Expect roughly 5.2 wet days totalling 36.5mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Moreno Valley is April–May.
Based on MARCH AFB, CA US (4.5km), 1995–2024. 13 years of December data.