Costa Mesa, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Costa Mesa, a city in Orange County, California.
Today
74°F
Mostly Sunny
Mostly sunny, with a high near 74. West wind 5 to 10 mph, with gusts as high as 20 mph.
7-day forecast for Costa Mesa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Tonight | 57°F | Mostly Clear | 0 to 10 mph NE | 0% |
| Wednesday | 75°F | Sunny | 0 to 5 mph S | 0% |
| Wednesday Night | 57°F | Mostly Clear | 0 to 5 mph N | 0% |
| Thursday | 79°F | Sunny | 0 to 5 mph W | 0% |
| Thursday Night | 59°F | Mostly Clear | 0 to 5 mph N | 0% |
| Friday | 83°F | Sunny | 5 to 10 mph N | 0% |
| Friday Night | 62°F | Clear | 5 to 10 mph N | 0% |
| Saturday | 86°F | Sunny | 5 mph NW | 0% |
| Saturday Night | 64°F | Mostly Clear | 5 to 10 mph N | 0% |
| Sunday | 86°F | Sunny | 0 to 5 mph N | 0% |
| Sunday Night | 65°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Monday | 83°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 63°F | Partly Cloudy | 0 to 5 mph SE | 1% |
Forecast source: National Weather Service (api.weather.gov) for Costa Mesa (33.666, -117.912). Updated through the day.
Growing snapshot for Costa Mesa
Growing season
365 days
Hardiness zone
10b
More local growing data for Costa Mesa: nearby ZIP 92626 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Santa Ana John Wayne Ap, Ca (2.4 mi from Costa Mesa). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.