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

62°F

17°C

Humidity 89%
Wind Speed ESE 4 MPH
Barometer 30.2 in (1022.69 mb)
Dewpoint 59°F (15°C)
Visibility NA
Last update 25 Dec 08:53 AM PST
Extended Forecast for

Fullerton CA

  • Christmas Day

    Christmas Day: Showers likely, mainly after 4pm. Mostly cloudy, with a high near 64. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

    High: 64 °F

    Showers
    Likely

  • Tonight

    Tonight: Showers. Low around 55. South wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.

    Low: 55 °F

    Showers

  • Friday

    Friday: Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 62. South wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.

    High: 62 °F

    Heavy Rain

  • Friday Night

    Friday Night: Showers likely and possibly a thunderstorm before 10pm, then a chance of showers. Mostly cloudy, with a low around 48. Southwest wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 48 °F

    Showers
    Likely then
    Chance
    Showers

  • Saturday

    Saturday: A slight chance of showers before 10am. Mostly sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.

    High: 60 °F

    Slight Chance
    Showers then
    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 65.

    High: 65 °F

    Sunny

  • Sunday Night

    Sunday Night: Mostly clear, with a low around 45.

    Low: 45 °F

    Mostly Clear

  • Monday

    Monday: Sunny, with a high near 68.

    High: 68 °F

    Sunny

Detailed Forecast

Christmas Day
Showers likely, mainly after 4pm. Mostly cloudy, with a high near 64. South wind around 10 mph, with gusts as high as 20 mph. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.
Tonight
Showers. Low around 55. South wind 5 to 10 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
Showers, with thunderstorms also possible after 10am. Some of the storms could produce heavy rainfall. High near 62. South wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Friday Night
Showers likely and possibly a thunderstorm before 10pm, then a chance of showers. Mostly cloudy, with a low around 48. Southwest wind around 5 mph. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Saturday
A slight chance of showers before 10am. Mostly sunny, with a high near 60. Calm wind becoming west around 5 mph in the afternoon. Chance of precipitation is 20%.
Saturday Night
Mostly clear, with a low around 45.
Sunday
Sunny, with a high near 65.
Sunday Night
Mostly clear, with a low around 45.
Monday
Sunny, with a high near 68.
Monday Night
Mostly clear, with a low around 48.
Tuesday
Mostly sunny, with a high near 72.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 51.
Wednesday
A chance of showers. Mostly cloudy, with a high near 71.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.89°N 117.94°W (Elev. 197 ft)
Last Update:
3:43 am PST Dec 25, 2025
Forecast Valid:
9am PST Dec 25, 2025-6pm PST Dec 31, 2025
 
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Additional Resources

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High Temperature

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Chance of Precipitation