Fullerton, CA Weather & Growing Conditions
This Afternoon
76°F
Mostly Sunny
Mostly sunny, with a high near 76. West wind 5 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 76°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Tonight | 56°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 77°F | Sunny | 0 to 5 mph S | 0% |
| Wednesday Night | 57°F | Mostly Clear | 0 to 5 mph NE | 0% |
| Thursday | 81°F | Sunny | 0 to 5 mph SW | 0% |
| Thursday Night | 58°F | Mostly Clear | 0 to 5 mph N | 0% |
| Friday | 85°F | Sunny | 0 to 5 mph NE | 0% |
| Friday Night | 61°F | Clear | 5 to 10 mph N | 0% |
| Saturday | 88°F | Sunny | 0 to 10 mph N | 0% |
| Saturday Night | 63°F | Clear | 5 to 15 mph N | 0% |
| Sunday | 88°F | Sunny | 0 to 10 mph NW | 0% |
| Sunday Night | 65°F | Partly Cloudy | 5 mph N | 0% |
| Monday | 85°F | Mostly Sunny | 0 to 5 mph SE | 0% |
| Monday Night | 63°F | Partly Cloudy | 0 to 5 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fullerton, CA
Growing season
365 days
Hardiness zone
10b
Explore more for Fullerton, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Fullerton Muni Ap, Ca (2.9 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 4, 2026.