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Acacia Park Fullerton Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  | |  | | | | |  | | | |
| Patchy Fog | Partly Cloudy | Patchy Fog | Mostly Clear | Patchy Fog | Mostly Clear | Patchy Fog | Mostly Clear | Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear |
| Hi: 90°FHi: 32°C | Lo: 67°FLo: 19°C | Hi: 90°FHi: 32°C | Lo: 68°FLo: 20°C | Hi: 92°FHi: 33°C | Lo: 68°FLo: 20°C | Hi: 92°FHi: 33°C | Lo: 68°FLo: 20°C | Hi: 92°FHi: 33°C | Lo: 69°FLo: 21°C | Hi: 93°FHi: 34°C | Lo: 70°FLo: 21°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1232 AM PDT Thu Aug 20 2026 
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Acacia Park Fullerton Forecast Discussion
Issued: 429 AM PDT Thu Aug 20 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Saturday)... Monsoonal moisture will increase for today into Friday, then decrease during the weekend. There is a slight chance of afternoon showers and thunderstorms for the mountains and deserts for today and Friday with decreasing chances on Saturday.
High temperatu...