November in Costa Mesa averages a daily high of 20.2°C with nights around 12.8°C. Expect roughly 3.4 wet days totalling 16.1mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Costa Mesa is May–November.
Based on NEWPORT BEACH HARBOR, CA US (5.3km), 1995–2024. 28 years of November data.