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

FW0063 Fullerton CSU (F0063)

Lat: 33.8805°NLon: 117.88417°WElev: 247.0ft.

NA

70°F

21°C

Humidity 84%
Wind Speed S 3 MPH
Barometer 30.02 in (1016.59 mb)
Dewpoint 65°F (18°C)
Visibility NA
Last update 21 Sep 11:08 AM PDT
Extended Forecast for

Fullerton CA

  • Today

    Today: A slight chance of showers. Mostly sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 82 °F

    Slight Chance
    Showers

  • Tonight

    Tonight: Partly cloudy, with a low around 65. West wind around 5 mph becoming calm after midnight.

    Low: 65 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 87. Light west wind becoming southwest 5 to 10 mph in the afternoon.

    High: 87 °F

    Mostly Sunny

  • Monday Night

    Monday Night: A slight chance of showers. Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.

    Low: 67 °F

    Slight Chance
    Showers

  • Tuesday

    Tuesday: A chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.

    High: 88 °F

    Chance
    T-storms

  • Tuesday Night

    Tuesday Night: A slight chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 68. Chance of precipitation is 20%.

    Low: 68 °F

    Slight Chance
    T-storms then
    Partly Cloudy

  • Wednesday

    Wednesday: Sunny, with a high near 85.

    High: 85 °F

    Sunny

  • Wednesday Night

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

    Low: 67 °F

    Mostly Clear

  • Thursday

    Thursday: Mostly sunny, with a high near 83.

    High: 83 °F

    Mostly Sunny

Detailed Forecast

Today
A slight chance of showers. Mostly sunny, with a high near 82. Calm wind becoming south around 5 mph in the afternoon. Chance of precipitation is 20%.
Tonight
Partly cloudy, with a low around 65. West wind around 5 mph becoming calm after midnight.
Monday
Mostly sunny, with a high near 87. Light west wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
A slight chance of showers. Partly cloudy, with a low around 67. Southwest wind around 5 mph becoming calm in the evening. Chance of precipitation is 20%.
Tuesday
A chance of showers and thunderstorms. Partly sunny, with a high near 88. Calm wind becoming southwest around 5 mph in the afternoon. Chance of precipitation is 30%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms.
Tuesday Night
A slight chance of showers and thunderstorms before 11pm. Partly cloudy, with a low around 68. Chance of precipitation is 20%.
Wednesday
Sunny, with a high near 85.
Wednesday Night
Mostly clear, with a low around 67.
Thursday
Mostly sunny, with a high near 83.
Thursday Night
Increasing clouds, with a low around 65.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 82.
Friday Night
Increasing clouds, with a low around 65.
Saturday
Mostly cloudy, then gradually becoming sunny, with a high near 81.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.87°N 117.93°W (Elev. 184 ft)
Last Update:
1:13 am PDT Sep 21, 2025
Forecast Valid:
11am PDT Sep 21, 2025-6pm PDT Sep 27, 2025
 
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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