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Mountain High School Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
 |  | |  |  | | | | | | | |
| Sunny | Mostly Clear | Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Sunny | Mostly Clear | Sunny | Clear |
| Lo: 55°FLo: 13°C | Lo: 51°FLo: 11°C | Lo: 53°FLo: 12°C | Lo: 55°FLo: 13°C | ||||||||
POP = Probability of Precipitation.
Weather Outlook Updated: 1135 PM PDT Fri Sep 18 2026 
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Issued: 151 AM PDT Sat Sep 19 2026
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...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE... SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO COUNTIES...
The 00z sounding Friday afternoon shows a well mixed marine boundary layer, around 3000 feet deep. Low clouds will be patchy overnight through the coastal basin and scatter out to the coast between 8-11 AM this morning.
While the coastal basin will maintain modest minimum relative humidity values (30-60% inland, 60-80% coast) this afternoon, conditions will...