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Sumach Weather Forecast
| REST OF TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY | MONDAY NIGHT | TUESDAY | WEDNESDAY | THURSDAY |
 |  |  |  | | |  | | |  |  | |
| Partly Cloudy | Chance of Showers | Mostly Clear | Chance of Showers | Partly Cloudy | Chance of Showers | Chance of Showers | Chance of Showers | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear |
| Lo: 47°FLo: 8°C | Hi: 70°FHi: 21°C | Lo: 47°FLo: 8°C | Hi: 70°FHi: 21°C | Lo: 45°FLo: 7°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C Lo: 46°FLo: 8°C | Hi: 75°FHi: 24°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 76°FHi: 24°C Lo: 50°FLo: 10°C | Hi: 80°FHi: 27°C Lo: 53°FLo: 12°C | Hi: 80°FHi: 27°C Lo: 53°FLo: 12°C |
| POP: 20% | POP: 50% | POP: 40% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1147 PM PDT Thu Sep 03 2026 
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Issued: 1030 PM PDT Thu Sep 3 2026
Key Messages
- Wet, unsettled weather with multiple rounds of light and moderate rain through Monday, heaviest in the mountains.
- Low repeated chances of thunder, mainly in the mountains, around 15-30%.
- Cooler below normal highs by 10-15 degrees through Saturday before returning to near average mid next week.
Discussion
... Latest water vapor imagery shows a deep mid- level closed low with its centered roughly offshore northwest OR with broad troughing encompassing much of the West Coast with another ...