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

88°F

31°C

Humidity 55%
Wind Speed W 5 MPH
Barometer 29.96 in (1014.56 mb)
Dewpoint 70°F (21°C)
Visibility NA
Heat Index93°F (34°C)
Last update 26 Aug 11:08 AM PDT
Extended Forecast for

Fullerton CA

Extreme Heat Warning August 26, 11:16am until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 26, 11:16am until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Today

    High: 100 °F

    Sunny

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 73. South wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Patchy Fog

  • Thursday

    Thursday: Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 101. Heat index values as high as 106. Calm wind becoming southwest around 5 mph in the afternoon.

    High: 101 °F

    Patchy Fog
    then Mostly
    Cloudy

  • Thursday Night

    Thursday Night: Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.

    Low: 73 °F

    Patchy Fog

  • Friday

    Friday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 100. Light southwest wind increasing to 5 to 10 mph in the afternoon.

    High: 100 °F

    Patchy Fog
    then Mostly
    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 73.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70.

    Low: 70 °F

    Mostly Clear

Detailed Forecast

Today
Sunny, with a high near 100. Southwest wind 5 to 10 mph.
Tonight
Patchy fog after 11pm. Otherwise, increasing clouds, with a low around 73. South wind around 5 mph becoming calm in the evening.
Thursday
Patchy fog before 11am. Otherwise, mostly cloudy, with a high near 101. Heat index values as high as 106. Calm wind becoming southwest around 5 mph in the afternoon.
Thursday Night
Patchy fog after 11pm. Otherwise, mostly cloudy, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Friday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 100. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Friday Night
Mostly clear, with a low around 73.
Saturday
Sunny, with a high near 96.
Saturday Night
Mostly clear, with a low around 70.
Sunday
Sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 68.
Monday
Sunny, with a high near 86.
Monday Night
Mostly clear, with a low around 67.
Tuesday
A slight chance of showers. Mostly sunny, with a high near 87.
Basemap Options
Click map to change the forecast location
Loading map...
Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.87°N 117.91°W (Elev. 184 ft)
Last Update:
10:04 am PDT Aug 26, 2026
Forecast Valid:
11am PDT Aug 26, 2026-6pm PDT Sep 1, 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