December in Eastvale averages a daily high of 20.2°C with nights around 4.1°C. Expect roughly 5 wet days totalling 37.6mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Eastvale is March–May.
Based on CHINO AIRPORT, CA US (5.8km), 1995–2024. 27 years of December data.