Fullerton, CA Weather & Growing Conditions
Today
89°F
Patchy Fog then Sunny
Patchy fog before 11am. Sunny, with a high near 89. Southwest wind 0 to 10 mph.
7-day forecast
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| Today | 89°F | Patchy Fog then Sunny | 0 to 10 mph SW | 0% |
| Tonight | 67°F | Partly Cloudy then Patchy Fog | 0 to 10 mph W | 0% |
| Wednesday | 88°F | Patchy Fog then Mostly Sunny | 0 to 10 mph SW | 0% |
| Wednesday Night | 68°F | Mostly Clear then Patchy Fog | 0 to 10 mph SW | 0% |
| Thursday | 90°F | Patchy Fog then Sunny | 0 to 10 mph SW | 0% |
| Thursday Night | 68°F | Mostly Clear then Patchy Fog | 0 to 5 mph S | 0% |
| Friday | 90°F | Patchy Fog then Sunny | 0 to 10 mph S | 0% |
| Friday Night | 69°F | Mostly Clear | 0 to 10 mph S | 0% |
| Saturday | 90°F | Sunny | 0 to 10 mph SW | 0% |
| Saturday Night | 69°F | Mostly Clear | 0 to 10 mph S | 0% |
| Sunday | 89°F | Sunny | 0 to 10 mph S | 0% |
| Sunday Night | 68°F | Mostly Clear | 0 to 10 mph S | 1% |
| Monday | 87°F | Sunny | 0 to 10 mph S | 1% |
| Monday Night | 67°F | Mostly Clear | 0 to 10 mph S | 1% |
Forecast source: National Weather Service (api.weather.gov). Updated through the day.
Growing snapshot for Fullerton, CA
Growing season
365 days
Hardiness zone
10a
Explore more for Fullerton, CA: full frost dates · planting calendar · California frost dates
Climate data from the nearest NOAA station, Fullerton Muni Ap, Ca (4.2 mi). Frost dates are 1991–2020 averages, not a forecast. Page updated Aug 4, 2026.