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Mountain Center Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT |
 |  | |  |  | | | | | | | |
| Chance of Showers | Partly Cloudy | Chance of Showers | Mostly Clear | Mostly Sunny | Clear | Mostly Sunny | Clear | Sunny | Mostly Clear | Mostly Sunny | Clear |
| Hi: 93°FHi: 34°C | Lo: 68°FLo: 20°C | Hi: 93°FHi: 34°C | Lo: 65°FLo: 18°C | Hi: 90°FHi: 32°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 53°FLo: 12°C | Hi: 83°FHi: 28°C | Lo: 52°FLo: 11°C | Hi: 83°FHi: 28°C | Lo: 52°FLo: 11°C |
| POP: 20% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 137 AM PDT Wed Sep 09 2026 
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Instant definitions for any meteorological term.
Issued: 409 AM PDT Wed Sep 9 2026
Discussion
...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
...UPDATED AVIATION DISCUSSION...
.SHORT TERM (Today through Friday)... There were showers and thunderstorms on Tuesday afternoon with the heavier rainfall mostly tied to peak heating during the mid and late afternoon though there was some isolated development less tied to terrain. For Riverside and San Diego Counties, development was generally on convergen...