Costa Mesa, California Weather:
Saturday, April 18, 2026
Rainy Weather
Day 66°
Night 61°
Precipitation 56 %
Wind 10 mph
UV Index (0 - 11+) 9
Weather Forecast History
Last Year's Weather on This Day (April 18, 2025)
Cloudy Weather

Day

63°

Night

52°

Wind

7 mph

UV Index

4

Precipitation

25 %