Costa Mesa, California Weather:
Friday, September 4, 2026
Cloudy Weather
Day 75°
Night 66°
Precipitation 6 %
Wind 7 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (September 4, 2025)
Rainy Night

Day

79°

Night

64°

Wind

5 mph

Precipitation

80 %