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Costa Mesa, CA
7-Day Forecast
Updated 9/20/2026, 4:59 PM PDT
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Sun • Sep 20
Overcast
• Wind WSW 9 mph
• Rain – 1% Chance
Low
64°
High
78°
Mon • Sep 21
Overcast
• Wind SSW 7 mph
• Rain – 8% Chance
Low
67°
High
72°
Tue • Sep 22
Overcast
• Wind WSW 9 mph
• Rain – 4% Chance
Low
61°
High
78°
Wed • Sep 23
Clear
• Wind SSW 9 mph
• Rain – 0% Chance
Low
70°
High
81°
Thu • Sep 24
Clear
• Wind SSW 9 mph
• Rain – 0% Chance
Low
70°
High
81°
Fri • Sep 25
Partly cloudy
• Wind WSW 9 mph
• Rain – 1% Chance
Low
71°
High
85°
Sat • Sep 26
Overcast
• Wind WSW 9 mph
• Rain – 1% Chance
Low
73°
High
87°
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