Costa Mesa, CA Weather & Growing Conditions
Overnight
67°F
Mostly Cloudy
Mostly cloudy, with a low around 67. Southeast wind around 0 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Overnight | 67°F | Mostly Cloudy | 0 mph | 0% |
| Tuesday | 78°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 67°F | Mostly Cloudy | 0 to 5 mph W | 0% |
| Wednesday | 79°F | Mostly Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 68°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Thursday | 80°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Thursday Night | 68°F | Partly Cloudy | 0 to 10 mph S | 0% |
| Friday | 80°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Friday Night | 69°F | Partly Cloudy | 0 to 10 mph S | 0% |
| Saturday | 81°F | Sunny | 0 to 10 mph SW | 0% |
| Saturday Night | 69°F | Partly Cloudy | 5 to 10 mph S | 0% |
| Sunday | 80°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Sunday Night | 69°F | Partly Cloudy | 5 to 10 mph S | 2% |
| Monday | 80°F | Mostly Sunny | 5 to 10 mph S | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Costa Mesa, CA
Growing season
365 days
Hardiness zone
10b
Explore more for Costa Mesa, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Newport Beach Harbor, Ca (3.8 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.