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Arnold Reservoir, CA Weather Forecast
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Arnold Reservoir Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear |
| Hi: 98°FHi: 37°C | Lo: 68°FLo: 20°C | Hi: 95°FHi: 35°C | Lo: 64°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 88°FHi: 31°C | Lo: 58°FLo: 14°C | Hi: 85°FHi: 29°C | Lo: 58°FLo: 14°C | Hi: 86°FHi: 30°C | Lo: 59°FLo: 15°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 232 AM PDT Fri Sep 11 2026 
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Issued: 349 AM PDT Fri Sep 11 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Sunday)... High pressure over southern California will weaken as a low pressure system moves southward off the British Columbia coast today and inland through the Pacific Northwest on Saturday. This will strengthen the onshore flow across southern California with drier southwest flow aloft. Coolin...