National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

FW0063 Fullerton CSU (F0063)

Lat: 33.8805°NLon: 117.88417°WElev: 243.01ft.

NA

91°F

33°C

Humidity 21%
Wind Speed NW 5 MPH
Barometer 30.06 in (1017.95 mb)
Dewpoint 46°F (8°C)
Visibility NA
Heat Index87°F (31°C)
Last update 12 Mar 05:28 PM PDT
Extended Forecast for

Fullerton CA

Heat Advisory until March 13, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory until March 13, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Tonight

    Low: 61 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 95. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 95 °F

    Sunny

  • Friday Night

    Friday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 59. Southwest wind around 5 mph becoming calm in the evening.

    Low: 59 °F

    Patchy Fog

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 87 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.

    Low: 55 °F

    Mostly Clear

  • Sunday

    Sunday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 90.

    High: 90 °F

    Patchy Fog
    then Mostly
    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

  • Monday

    Monday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

Detailed Forecast

Tonight
Mostly clear, with a low around 61. West wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 95. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 59. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 55. Southwest wind around 5 mph becoming calm in the evening.
Sunday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 90.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Sunny, with a high near 96.
Monday Night
Mostly clear, with a low around 61.
Tuesday
Sunny, with a high near 98.
Tuesday Night
Clear, with a low around 61.
Wednesday
Sunny, with a high near 95.
Wednesday Night
Mostly clear, with a low around 60.
Thursday
Sunny, with a high near 96.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.87°N 117.93°W (Elev. 184 ft)
Last Update:
12:13 pm PDT Mar 12, 2026
Forecast Valid:
6pm PDT Mar 12, 2026-6pm PDT Mar 19, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation