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Cornwall Historical Marker Weather Forecast
| TONIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | LABOR DAY |
 |  | | | | |  |  | | | | |
| Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Chance of Rain | Chance of Rain | Chance of Rain | Chance of Rain | Chance of T-Storm | Chance of Rain |
| Lo: 53°FLo: 12°C | Hi: 56°FHi: 13°C | Lo: 50°FLo: 10°C | Hi: 63°FHi: 17°C | Lo: 50°FLo: 10°C | Hi: 66°FHi: 19°C | Lo: 46°FLo: 8°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 70°FHi: 21°C | Lo: 50°FLo: 10°C | Hi: 73°FHi: 23°C |
| POP: 30% | POP: 90% | POP: 60% | POP: 70% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 449 PM PDT Tue Sep 01 2026 
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Issued: 1005 PM PDT Tue Sep 1 2026
Key Messages
- There is a slight chance of thunderstorms along the Cascades and Cascade foothills this afternoon.
- An unusually strong system for early September will bring wetting rain to the region with gusty winds along the coast Wednesday.
- Rock slides are possible along highways 42, 138 and 38.
- Pockets of frost are possible tonight east of the Cascades.
- Temperatures will be 15 to 25 degrees cooler than normal Wednesday and Thursday.
- Cooler conditions with shower chances persisting into early nex...