California · NWS SGX office

Fullerton, CA weather

It is 64°F and clear at Fullerton, Fullerton Municipal Airport as of Oct 27, 11:00 PM PDT. Tonight: Mostly Cloudy, low near 57°F. Forecast from the National Weather Service, issued Oct 27, 11:13 PM PDT.

Updated Oct 27, 11:17 PM PDT (snapshot)

Current conditions

Temperature

64°F

Clear

Wind

E 5 mph

Humidity 77% · dew point 57°F

Pressure · visibility

29.96 inHg

Visibility 10 mi

Observed at Fullerton, Fullerton Municipal Airport (KFUL), Oct 27, 11:00 PM PDT. Station readings can lag or be missing.

Alerts for this area

No active NWS alerts cover the Fullerton forecast zone right now.

Around the NWS SGX forecast area

1 active alert covers zones served by the SGX office near Fullerton:

  • Coastal Flood Warning

From the alert snapshot of Oct 28, 2026, 2:15 AM EDT. California has 8 active alerts: see them all.

For official warnings, check weather.gov and your local authorities. OpenForecast repeats National Weather Service alerts and may be delayed or incomplete. Follow instructions from emergency officials.

Next 24 hours

Hourly forecast for Fullerton (local time)
TimeTempForecastPrecip. chanceWind
Tue 11 PM62°FMostly Cloudy0%SE 5 mph
Wed 12 AM61°FMostly Cloudy0%E 5 mph
Wed 1 AM60°FMostly Cloudy0%E 5 mph
Wed 2 AM60°FMostly Cloudy0%NE 5 mph
Wed 3 AM59°FMostly Cloudy0%E 5 mph
Wed 4 AM58°FMostly Cloudy0%NE 5 mph
Wed 5 AM58°FPartly Cloudy0%NE 5 mph
Wed 6 AM57°FMostly Sunny0%NE 5 mph
Wed 7 AM57°FMostly Sunny0%NE 5 mph
Wed 8 AM58°FMostly Sunny0%NE 5 mph
Wed 9 AM62°FMostly Sunny0%E 5 mph
Wed 10 AM66°FMostly Sunny0% 0 mph
Wed 11 AM71°FSunny0% 0 mph
Wed 12 PM73°FSunny0% 0 mph
Wed 1 PM75°FSunny0%S 5 mph
Wed 2 PM77°FMostly Sunny0%SW 5 mph
Wed 3 PM76°FMostly Sunny0%S 5 mph
Wed 4 PM75°FMostly Sunny0%SW 5 mph
Wed 5 PM74°FMostly Sunny0%SW 10 mph
Wed 6 PM71°FPartly Cloudy0%SW 5 mph
Wed 7 PM68°FPartly Cloudy0%SW 5 mph
Wed 8 PM66°FMostly Cloudy0%SW 5 mph
Wed 9 PM64°FMostly Cloudy0%W 5 mph
Wed 10 PM63°FMostly Cloudy0% 0 mph

Hourly values come from the NWS gridded forecast for the 2.5 km grid square that covers the city's center point. Conditions elsewhere in Fullerton can differ.

7-day forecast

Tonight

Low 57°F

Mostly cloudy, with a low around 57. East wind around 5 mph.

Wednesday

High 77°F·Low 58°F

Mostly sunny, with a high near 77. South wind 0 to 10 mph.

Wednesday Night: Mostly cloudy, with a low around 58. West wind 0 to 5 mph.

Thursday

High 75°F·Low 61°F

Partly sunny, with a high near 75. Southeast wind 0 to 10 mph.

Thursday Night: Mostly cloudy, with a low around 61. South wind 0 to 5 mph.

Friday

High 73°F·Low 57°F

Partly sunny, with a high near 73.

Friday Night: A slight chance of rain showers between 11pm and 5am. Mostly cloudy, with a low around 57.

Saturday

High 73°F·Low 57°F

A chance of rain showers after 11am. Mostly cloudy, with a high near 73.

Saturday Night: Rain showers likely. Mostly cloudy, with a low around 57.

Sunday

High 72°F·Low 56°F

A chance of rain showers before 4pm. Partly sunny, with a high near 72.

Sunday Night: Mostly clear, with a low around 56.

Monday

High 76°F·Low 57°F

Sunny, with a high near 76.

Monday Night: Mostly clear, with a low around 57.

Tuesday

High 77°F

Mostly sunny, with a high near 77.

Nearby cities

Larger cities in the area

Other cities in Orange County

See every city we cover in California, or check all active alerts.

About this forecast

Forecast office
Fullerton is served by the National Weather Service SGX forecast office, forecast zone CAZ554, county zone CAC059.
Location used
The Census Bureau's internal point for Fullerton (33.8857, -117.9280), in Orange County. Population: 140,054 (2024 estimate), number 42 of the 296 California cities on this site.
Radar
Nearest NWS radar: KSOX. View it on radar.weather.gov.

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Sources

  • Forecast, hourly forecast, observations and alerts: National Weather Service API, api.weather.gov/points/33.8857,-117.928 (forecast issued Oct 27, 11:13 PM PDT).
  • Official forecast page: forecast.weather.gov.
  • City location and population: U.S. Census Bureau, Vintage 2024 population estimates and 2024 Gazetteer files.
  • Snapshot taken Oct 28, 2026. The NWS and Census Bureau do not endorse OpenForecast.

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