Costa Mesa, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Costa Mesa, a city in Orange County, California.
This Afternoon
75°F
Sunny
Sunny, with a high near 75. Southwest wind around 10 mph.
7-day forecast for Costa Mesa
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 75°F | Sunny | 10 mph SW | 0% |
| Tonight | 64°F | Partly Cloudy | 0 to 10 mph S | 2% |
| Saturday | 78°F | Mostly Sunny | 0 to 10 mph S | 1% |
| Saturday Night | 65°F | Mostly Cloudy | 0 to 5 mph S | 1% |
| Sunday | 76°F | Partly Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 65°F | Mostly Cloudy | 0 to 10 mph S | 1% |
| Monday | 75°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Monday Night | 64°F | Partly Cloudy | 0 to 10 mph S | 2% |
| Tuesday | 76°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 65°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 81°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 67°F | Partly Cloudy | 0 to 10 mph SW | 2% |
| Thursday | 83°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Thursday Night | 68°F | Partly Cloudy | 0 to 5 mph SW | 0% |
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 Sep 18, 2026.