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Winchester, CA Weather Forecast
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| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  | | | | | | | | | | |
| Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny |
| Lo: 71°FLo: 22°C | Hi: 99°FHi: 37°C | Lo: 68°FLo: 20°C | Hi: 93°FHi: 34°C | Lo: 62°FLo: 17°C | Hi: 90°FHi: 32°C | Lo: 61°FLo: 16°C | Hi: 89°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 87°FHi: 31°C | Lo: 58°FLo: 14°C | Hi: 88°FHi: 31°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 1121 AM PDT Thu Sep 10 2026 
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Issued: 1202 PM PDT Thu Sep 10 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
Another hot day out there as high pressure continues to dominate the desert southwest. Weakening is seen in this system today though, as observations show better onshore flow closer to the coast. This is keeping temperatures a bit cooler than at this time yesterday with more places in the 80s instead of the 90s, so the high temperature forecast may be over...