Fullerton, CA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Fullerton, a city in Orange County, California.
Today
75°F
Mostly Sunny
Mostly sunny, with a high near 75. West wind 5 to 10 mph.
7-day forecast for Fullerton
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 75°F | Mostly Sunny | 5 to 10 mph W | 0% |
| Tonight | 56°F | Mostly Clear | 5 mph SE | 0% |
| Wednesday | 76°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 | 84°F | Sunny | 0 to 5 mph N | 0% |
| Friday Night | 61°F | Clear | 0 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 | 87°F | Sunny | 0 to 10 mph NW | 0% |
| Sunday Night | 64°F | Partly Cloudy | 0 to 5 mph NW | 0% |
| Monday | 85°F | Mostly Sunny | 0 to 5 mph S | 0% |
| Monday Night | 62°F | Partly Cloudy | 0 to 5 mph E | 1% |
Forecast source: National Weather Service (api.weather.gov) for Fullerton (33.886, -117.928). Updated through the day.
Growing snapshot for Fullerton
Growing season
365 days
Hardiness zone
10b
More local growing data for Fullerton: nearby ZIP 92832 weather · frost dates · planting calendar · California frost dates
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Climate data from the nearest NOAA station, Fullerton Muni Ap, Ca (2.9 mi from Fullerton). Frost dates are 1991–2020 averages, not a forecast. Page updated Nov 3, 2026.