Fountain Valley, CA Weather & Growing Conditions
Tonight
65°F
Partly Cloudy
Partly cloudy, with a low around 65. South wind 0 to 5 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Tonight | 65°F | Partly Cloudy | 0 to 5 mph S | 1% |
| Saturday | 79°F | Mostly Sunny | 0 to 10 mph S | 1% |
| Saturday Night | 66°F | Mostly Cloudy | 0 to 5 mph S | 1% |
| Sunday | 77°F | Partly Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 66°F | Mostly Cloudy | 0 to 10 mph S | 1% |
| Monday | 76°F | Mostly Sunny | 5 to 10 mph S | 0% |
| Monday Night | 65°F | Partly Cloudy | 0 to 10 mph S | 2% |
| Tuesday | 77°F | Mostly Sunny | 0 to 10 mph SW | 0% |
| Tuesday Night | 66°F | Mostly Clear | 0 to 10 mph SW | 0% |
| Wednesday | 82°F | Sunny | 0 to 10 mph W | 0% |
| Wednesday Night | 68°F | Mostly Clear | 0 to 10 mph SW | 2% |
| Thursday | 83°F | Mostly Sunny | 0 to 10 mph SW | 2% |
| Thursday Night | 69°F | Partly Cloudy | 0 to 5 mph SW | 0% |
| Friday | 85°F | Mostly Sunny | 0 to 10 mph W | 2% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fountain Valley, CA
Growing season
365 days
Hardiness zone
10b
Explore more for Fountain Valley, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Santa Ana John Wayne Ap, Ca (5.3 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 19, 2026.