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Fullerton School Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  | | | | | | | | |  |  |
| Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Chance of Showers |
| Hi: 87°FHi: 31°C | Lo: 70°FLo: 21°C | Hi: 91°FHi: 33°C | Lo: 72°FLo: 22°C | Hi: 91°FHi: 33°C | Lo: 67°FLo: 19°C | Hi: 87°FHi: 31°C | Lo: 65°FLo: 18°C | Hi: 83°FHi: 28°C | Lo: 62°FLo: 17°C | Hi: 75°FHi: 24°C | Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 221 AM PDT Thu Oct 15 2026 
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Issued: 426 AM PDT Thu Oct 15 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
Today through tomorrow night...
As an upper level low that has been cut off east of the region establishes itself to the southwest of San Diego, with a high positioned to the north over northwestern Nevada in a rex blocking pattern, the pressure gradient between the two are going to allow for offshore winds to strengthen, in...