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

32°C

90°F

Humidity 59%
Wind Speed S 0 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 23°C (74°F)
Visibility NA
Heat Index37°C (99°F)
Last update 07 Sep 02:53 PM PDT
Extended Forecast for

Fullerton CA

Heat Advisory September 8, 10:00am until September 10, 08:00pm
Click here for hazard details and duration
Heat Advisory

  • Labor Day

    Labor Day: A slight chance of showers. Partly sunny, with a high near 33. West wind 10 to 15 km/h. Chance of precipitation is 20%.

    High: 33 °C

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 22. West wind 5 to 10 km/h becoming calm in the evening.

    Low: 22 °C

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 37. Light and variable wind becoming west 10 to 15 km/h in the afternoon.

    High: 37 °C

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly clear, with a low around 23. West wind 5 to 10 km/h becoming calm in the evening.

    Low: 23 °C

    Mostly Clear

  • Wednesday

    Wednesday: Sunny, with a high near 36. Light and variable wind becoming southwest 10 to 15 km/h in the afternoon.

    High: 36 °C

    Sunny

  • Wednesday Night

    Wednesday Night: Mostly clear, with a low around 23.

    Low: 23 °C

    Mostly Clear

  • Thursday

    Thursday: Sunny, with a high near 35.

    High: 35 °C

    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 21.

    Low: 21 °C

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 31.

    High: 31 °C

    Sunny

Detailed Forecast

Labor Day
A slight chance of showers. Partly sunny, with a high near 33. West wind 10 to 15 km/h. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 22. West wind 5 to 10 km/h becoming calm in the evening.
Tuesday
Mostly sunny, with a high near 37. Light and variable wind becoming west 10 to 15 km/h in the afternoon.
Tuesday Night
Mostly clear, with a low around 23. West wind 5 to 10 km/h becoming calm in the evening.
Wednesday
Sunny, with a high near 36. Light and variable wind becoming southwest 10 to 15 km/h in the afternoon.
Wednesday Night
Mostly clear, with a low around 23.
Thursday
Sunny, with a high near 35.
Thursday Night
Mostly clear, with a low around 21.
Friday
Sunny, with a high near 31.
Friday Night
Mostly clear, with a low around 20.
Saturday
Sunny, with a high near 29.
Saturday Night
Mostly clear, with a low around 19.
Sunday
Sunny, with a high near 29.
Sunday Night
Clear, with a low around 19.
Monday
Sunny, with a high near 29.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.87°N 117.93°W (Elev. 184 m)
Last Update:
12:03 pm PDT Sep 7, 2026
Forecast Valid:
3pm PDT Sep 7, 2026-6pm PDT Sep 14, 2026
 
Forecast Discussion
 
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Additional Resources

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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