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

66°F

19°C

Humidity 56%
Wind Speed ENE 1 MPH
Barometer 30.03 in (1016.93 mb)
Dewpoint 50°F (10°C)
Visibility NA
Last update 18 Mar 04:08 AM PDT
Extended Forecast for

Fullerton CA

Heat Advisory March 18, 04:28am until March 20, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory March 18, 04:28am until March 20, 08:00pm

    NOW until 8:00pm Fri

    Heat Advisory

  • Today

    High: 97 °F

    Sunny

  • Tonight

    Tonight: Clear, with a low around 63. Southwest wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Clear

  • Thursday

    Thursday: Sunny, with a high near 99. Light west wind becoming southwest 5 to 10 mph in the afternoon.

    High: 99 °F

    Sunny

  • Thursday Night

    Thursday Night: Clear, with a low around 64. Southwest wind around 5 mph becoming calm in the evening.

    Low: 64 °F

    Clear

  • Friday

    Friday: Sunny, with a high near 98. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 98 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

  • Saturday

    Saturday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 91.

    High: 91 °F

    Patchy Fog
    then Mostly
    Sunny

  • Saturday Night

    Saturday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 59.

    Low: 59 °F

    Patchy Fog

Detailed Forecast

Today
Sunny, with a high near 97. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Tonight
Clear, with a low around 63. Southwest wind around 5 mph becoming calm in the evening.
Thursday
Sunny, with a high near 99. Light west wind becoming southwest 5 to 10 mph in the afternoon.
Thursday Night
Clear, with a low around 64. Southwest wind around 5 mph becoming calm in the evening.
Friday
Sunny, with a high near 98. Calm wind becoming southwest around 5 mph in the afternoon.
Friday Night
Mostly clear, with a low around 62.
Saturday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 91.
Saturday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 59.
Sunday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 87.
Sunday Night
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 58.
Monday
Patchy fog. Otherwise, mostly sunny, with a high near 85.
Monday Night
Patchy fog. Otherwise, partly cloudy, with a low around 59.
Tuesday
Patchy fog. Otherwise, mostly sunny, with a high near 84.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.89°N 117.94°W (Elev. 197 ft)
Last Update:
2:13 am PDT Mar 18, 2026
Forecast Valid:
4am PDT Mar 18, 2026-6pm PDT Mar 24, 2026
 
Forecast Discussion
 
Get as KML Get as XML

Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation