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

88°F

31°C

Humidity 46%
Wind Speed NW 4 MPH
Barometer 29.98 in (1015.24 mb)
Dewpoint 65°F (18°C)
Visibility NA
Heat Index90°F (32°C)
Last update 08 Aug 12:08 PM PDT
Extended Forecast for

Fullerton CA

Heat Advisory August 9, 03:01am until August 9, 08:00pm
Click here for hazard details and duration
Heat Advisory
  •  
    Heat Advisory August 9, 03:01am until August 9, 08:00pm

    NOW until 8:00pm Sun

    Heat Advisory

  • Overnight

    Low: 69 °F

    Mostly Clear

  • Sunday

    Sunday: Sunny, with a high near 91. Light west wind becoming southwest 5 to 10 mph in the morning.

    High: 91 °F

    Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 69. South wind 5 to 10 mph becoming light in the evening.

    Low: 69 °F

    Partly Cloudy

  • Monday

    Monday: Patchy fog between 8am and 11am. Otherwise, mostly sunny, with a high near 89. Light southwest wind increasing to 5 to 10 mph in the morning.

    High: 89 °F

    Patchy Fog
    then Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 68. Southwest wind around 5 mph.

    Low: 68 °F

    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 87.

    High: 87 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Partly cloudy, with a low around 67.

    Low: 67 °F

    Partly Cloudy

  • Wednesday

    Wednesday: Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85.

    High: 85 °F

    Patchy Fog
    then Sunny

Detailed Forecast

Overnight
Mostly clear, with a low around 69. Calm wind.
Sunday
Sunny, with a high near 91. Light west wind becoming southwest 5 to 10 mph in the morning.
Sunday Night
Partly cloudy, with a low around 69. South wind 5 to 10 mph becoming light in the evening.
Monday
Patchy fog between 8am and 11am. Otherwise, mostly sunny, with a high near 89. Light southwest wind increasing to 5 to 10 mph in the morning.
Monday Night
Partly cloudy, with a low around 68. Southwest wind around 5 mph.
Tuesday
Mostly sunny, with a high near 87.
Tuesday Night
Partly cloudy, with a low around 67.
Wednesday
Patchy fog before 11am. Otherwise, mostly sunny, with a high near 85.
Wednesday Night
Partly cloudy, with a low around 66.
Thursday
Partly sunny, with a high near 83.
Thursday Night
Partly cloudy, with a low around 66.
Friday
Mostly sunny, with a high near 83.
Friday Night
Partly cloudy, with a low around 65.
Saturday
Mostly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Fullerton CA
 33.89°N 117.94°W (Elev. 197 ft)
Last Update:
12:31 am PDT Aug 9, 2026
Forecast Valid:
3am PDT Aug 9, 2026-6pm PDT Aug 15, 2026
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

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High Temperature

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Chance of Precipitation