Current conditions at

FW0063 Fullerton CSU (F0063)

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

NA

79°F

26°C

Humidity 80%
Wind Speed WNW 1 MPH
Barometer 29.9 in (1012.53 mb)
Dewpoint 72°F (22°C)
Visibility NA
Heat Index82°F (28°C)
Last update 28 Aug 01:23 AM PDT
Extended Forecast for

Fullerton CA

Extreme Heat Warning August 28, 01:34am until August 28, 08:00pm
Click here for hazard details and duration
Extreme Heat Warning
  •  
    Extreme Heat Warning August 28, 01:34am until August 28, 08:00pm

    NOW until 8:00pm Fri

    Extreme Heat Warning

  • Overnight

    Low: 75 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly cloudy, then gradually becoming sunny, with a high near 100. Heat index values as high as 105. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 100 °F

    Decreasing
    Clouds

  • Friday Night

    Friday Night: Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm  in the evening.

    Low: 73 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 96. Light southwest wind increasing to 5 to 10 mph in the afternoon.

    High: 96 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 70. Southwest wind around 5 mph becoming south after midnight.

    Low: 70 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 90.

    High: 90 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 67.

    Low: 67 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 87.

    High: 87 °F

    Sunny

Detailed Forecast

Overnight
Mostly cloudy, with a low around 75. Calm wind.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 100. Heat index values as high as 105. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Friday Night
Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 96. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 70. Southwest wind around 5 mph becoming south after midnight.
Sunday
Sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 67.
Monday
Sunny, with a high near 87.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 85.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 67.
Wednesday
A slight chance of showers. Partly sunny, with a high near 88.
Wednesday Night
Mostly cloudy, with a low around 69.
Thursday
A slight chance of showers. Mostly sunny, with a high near 90.
Basemap Options
Click map to change the forecast location
Loading map...

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.87°N 117.93°W (Elev. 184 ft)
1:07 am PDT Aug 28, 2026
1am PDT Aug 28, 2026-6pm PDT Sep 3, 2026
 
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