Costa Mesa, California Weather:
Sunday, September 6, 2026
Sunny Weather
Day 77°
Night 70°
Precipitation 1 %
Wind 6 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (September 6, 2025)
Cloudy Night

Day

75°

Night

64°

Wind

5 mph

Precipitation

0 %