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

Hazardous Weather Conditions

Current conditions at

Fullerton, Fullerton Municipal Airport (KFUL)

Lat: 33.87194°NLon: 117.98472°WElev: 95.0ft.

Clear

88°F

31°C

Humidity 16%
Wind Speed N 0 MPH
Barometer 29.93 in (1013.55 mb)
Dewpoint 38°F (3°C)
Visibility 10.00 mi
Heat Index84°F (29°C)
Last update 17 Oct 03:35 PM PDT
Extended Forecast for

Fullerton Municipal CA

Heat Advisory October 17, 03:56pm until October 17, 08:00pm
Click here for hazard details and duration
...
  •  
    Heat Advisory October 17, 03:56pm until October 17, 08:00pm

    NOW until 8:00pm Sat

    Heat Advisory

  • Tonight

    Low: 66 °F

    Partly Cloudy

  • Sunday

    Sunday: Sunny, with a high near 88. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 88 °F

    Sunny

  • Sunday Night

    Sunday Night: Increasing clouds, with a low around 63. West wind around 5 mph becoming calm in the evening.

    Low: 63 °F

    Increasing
    Clouds

  • Monday

    Monday: Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.

    High: 84 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Increasing clouds, with a low around 63. Southwest wind around 5 mph becoming calm after midnight.

    Low: 63 °F

    Increasing
    Clouds

  • Tuesday

    Tuesday: Mostly cloudy, then gradually becoming sunny, with a high near 79.

    High: 79 °F

    Decreasing
    Clouds

  • Tuesday Night

    Tuesday Night: A slight chance of showers after 11pm. Partly cloudy, with a low around 61. Chance of precipitation is 20%.

    Low: 61 °F

    Slight Chance
    Showers

  • Wednesday

    Wednesday: A chance of showers. Partly sunny, with a high near 76.

    High: 76 °F

    Chance
    Showers

Detailed Forecast

Tonight
Partly cloudy, with a low around 66. Southeast wind around 5 mph becoming calm in the evening.
Sunday
Sunny, with a high near 88. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Sunday Night
Increasing clouds, with a low around 63. West wind around 5 mph becoming calm in the evening.
Monday
Patchy fog before 11am. Otherwise, mostly cloudy, then gradually becoming sunny, with a high near 84. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Monday Night
Increasing clouds, with a low around 63. Southwest wind around 5 mph becoming calm after midnight.
Tuesday
Mostly cloudy, then gradually becoming sunny, with a high near 79.
Tuesday Night
A slight chance of showers after 11pm. Partly cloudy, with a low around 61. Chance of precipitation is 20%.
Wednesday
A chance of showers. Partly sunny, with a high near 76.
Wednesday Night
Showers likely and possibly a thunderstorm. Mostly cloudy, with a low around 60.
Thursday
Showers likely, mainly before 11am. Mostly cloudy, with a high near 71.
Thursday Night
A chance of showers. Partly cloudy, with a low around 57.
Friday
Sunny, with a high near 72.
Friday Night
Mostly clear, with a low around 58.
Saturday
Sunny, with a high near 76.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Fullerton Municipal CA
 33.86°N 117.99°W (Elev. 69 ft)
Last Update:
12:25 pm PDT Oct 17, 2026
Forecast Valid:
3pm PDT Oct 17, 2026-6pm PDT Oct 24, 2026
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation