Costa Mesa, California Weather:
Monday, April 20, 2026
Cloudy Weather
Day 66°
Night 54°
Precipitation 20 %
Wind 1 mph
UV Index (0 - 11+) 8
Weather Forecast History
Last Year's Weather on This Day (April 20, 2025)
Cloudy Weather

Day

70°

Night

54°

Wind

7 mph

UV Index

9

Precipitation

0 %