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Lake Arrowhead Weather Forecast
| TODAY | TONIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT |
 |  |  | | | | | | | | | |
| Partly Cloudy | Mostly Clear | Mostly Sunny | Clear | Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Partly Cloudy | Mostly Clear |
| Lo: 55°FLo: 13°C | Lo: 56°FLo: 13°C | Lo: 54°FLo: 12°C | Lo: 53°FLo: 12°C | ||||||||
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM PDT Mon Sep 21 2026 
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Issued: 159 AM PDT Mon Sep 21 2026
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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
.SHORT TERM (Today through Wednesday)... A weak upper level low pressure system will move inland through central and southern California today with high temperatures a few to around 5 degrees cooler than Sunday and as much as 5 to 10 degrees below average for the valleys. High temperatures for today will range from the lower to mid 70s near the coast to th...