Best Time to Visit Costa Mesa
Best time: Jul, Jun, Aug, May.
Aug is warmest (25°C high); Jan is rainiest (70 mm).
Costa Mesa weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | 18.7 | 8.1 | 70 | 4.5 |
| Feb | 19 | 9.1 | 69 | 5.5 |
| Mar | 18.9 | 9.7 | 59 | 7.6 |
| Apr | 20.4 | 11 | 17 | 9.8 |
| May | 20.8 | 13.1 | 5 | 10.2 |
| Jun | 22.5 | 15.2 | 2 | 10.8 |
| Jul | 24.2 | 16.9 | 1 | 11 |
| Aug | 25 | 17.5 | 3 | 10.5 |
| Sep | 24.9 | 16.6 | 8 | 8.6 |
| Oct | 23.6 | 14.2 | 8 | 6.6 |
| Nov | 21.3 | 10.4 | 32 | 5.2 |
| Dec | 19 | 8 | 46 | 4.3 |
Average high temperature
Best months by activity
Overall: JulJunAugMay
Beaches: AugJulJunSep
Hiking: JunJulMayAug
Sightseeing: JulJunAugMay
Costa Mesa quick facts
What to pack
Mild year-round — pack layers and a light jacket.
Frequently asked questions
When is the best time to visit Costa Mesa?
Jul, Jun, Aug, May.
What is the rainiest month?
Jan, about 70 mm.
What is the warmest month?
Aug, with average highs of 25°C.
Where to stay
See Costa Mesa hotels · Book Costa Mesa tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.