Costa Mesa, California Weather:
Saturday, September 12, 2026
Cloudy Weather
Day 77°
Night 68°
Precipitation 20 %
Wind 2 mph
UV Index (0 - 11+) 7
Weather Forecast History
Last Year's Weather on This Day (September 12, 2025)
Cloudy Night

Day

75°

Night

64°

Wind

6 mph

Precipitation

1 %