Costa Mesa, CA Weather & Growing Conditions
Today
74°F
Patchy Drizzle then Sunny
Patchy drizzle before 10am. Sunny, with a high near 74. South wind around 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 74°F | Patchy Drizzle then Sunny | 5 mph S | 7% |
| Tonight | 57°F | Partly Cloudy | 5 mph N | 0% |
| Thursday | 79°F | Mostly Sunny | 0 to 10 mph NW | 0% |
| Thursday Night | 60°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Friday | 84°F | Sunny | 5 to 10 mph NW | 0% |
| Friday Night | 63°F | Mostly Clear | 5 to 10 mph N | 0% |
| Saturday | 85°F | Sunny | 5 to 10 mph N | 0% |
| Saturday Night | 64°F | Mostly Clear | 5 to 10 mph N | 0% |
| Sunday | 85°F | Sunny | 5 mph NW | 0% |
| Sunday Night | 65°F | Partly Cloudy | 5 mph NW | 0% |
| Monday | 83°F | Mostly Sunny | 0 to 5 mph E | 0% |
| Monday Night | 63°F | Partly Cloudy | 0 to 5 mph N | 0% |
| Tuesday | 80°F | Mostly Sunny | 0 to 5 mph S | 1% |
| Tuesday Night | 62°F | Mostly Clear | 0 to 5 mph SE | 3% |
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 Nov 4, 2026.