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Arrowhead Park Weather Forecast
| TODAY | TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT |
 |  | | |  | | |  | | | | |
| Partly Cloudy | Mostly Clear | Partly Cloudy | Mostly Clear | Patchy Fog | Mostly Clear | Patchy Fog | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 82°FHi: 28°C | Lo: 63°FLo: 17°C | Hi: 83°FHi: 28°C | Lo: 64°FLo: 18°C | Hi: 84°FHi: 29°C | Lo: 67°FLo: 19°C | Hi: 88°FHi: 31°C | Lo: 68°FLo: 20°C | Hi: 90°FHi: 32°C | Lo: 67°FLo: 19°C | Hi: 84°FHi: 29°C | Lo: 63°FLo: 17°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1255 AM PDT Tue Sep 22 2026 
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Issued: 441 AM PDT Tue Sep 22 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Thursday)... A weak low pressure system will develop off the coast of northern Baja today and linger into Thursday with weak lower-level easterly flow and east winds for the mountains at times on Wednesday and Thursday. High temperatures for today will warm a few degrees near the coast to 5 to loc...