Hazardous Weather Conditions
Current conditions at
FW0063 Fullerton CSU (F0063)
Lat: 33.8805°NLon: 117.88417°WElev: 243.01ft.NA
79°F
26°C
| Humidity | 80% |
| Wind Speed | WNW 1 MPH |
| Barometer | 29.9 in (1012.53 mb) |
| Dewpoint | 72°F (22°C) |
| Visibility | NA |
| Heat Index | 82°F (28°C) |
| Last update | 28 Aug 01:23 AM PDT |
Extended Forecast for
Fullerton CA
Extreme Heat Warning August 28, 01:34am until August 28, 08:00pm
NOW until 8:00pm Fri

Extreme Heat Warning
Overnight

Low: 75 °F
Mostly Cloudy
Friday

High: 100 °F
Decreasing
CloudsFriday Night

Low: 73 °F
Mostly Clear
Saturday

High: 96 °F
Sunny
Saturday Night

Low: 70 °F
Mostly Clear
Sunday

High: 90 °F
Sunny
Sunday Night

Low: 67 °F
Mostly Clear
Monday

High: 87 °F
Sunny
Detailed Forecast
Overnight
Mostly cloudy, with a low around 75. Calm wind.
Friday
Mostly cloudy, then gradually becoming sunny, with a high near 100. Heat index values as high as 105. Light and variable wind becoming southwest 5 to 10 mph in the afternoon.
Friday Night
Mostly clear, with a low around 73. Southwest wind around 5 mph becoming calm in the evening.
Saturday
Sunny, with a high near 96. Light southwest wind increasing to 5 to 10 mph in the afternoon.
Saturday Night
Mostly clear, with a low around 70. Southwest wind around 5 mph becoming south after midnight.
Sunday
Sunny, with a high near 90.
Sunday Night
Mostly clear, with a low around 67.
Monday
Sunny, with a high near 87.
Monday Night
Mostly clear, with a low around 66.
Tuesday
Sunny, with a high near 85.
Tuesday Night
A slight chance of showers. Mostly cloudy, with a low around 67.
Wednesday
A slight chance of showers. Partly sunny, with a high near 88.
Wednesday Night
Mostly cloudy, with a low around 69.
Thursday
A slight chance of showers. Mostly sunny, with a high near 90.
Additional Forecasts and Information
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ABOUT THIS FORECAST
Point Forecast:
Fullerton CA
33.87°N 117.93°W (Elev. 184 ft)
33.87°N 117.93°W (Elev. 184 ft)
1:07 am PDT Aug 28, 2026
1am PDT Aug 28, 2026-6pm PDT Sep 3, 2026



