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Summit Trail Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  |  |  |  | | |  | | | | |
| Chance of T-Storm | Chance of T-Storm | Clearing | Clear | Sunny | Mostly Clear | Partly Cloudy | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 63°FHi: 17°C | Lo: 43°FLo: 6°C | Hi: 66°FHi: 19°C | Lo: 43°FLo: 6°C | Hi: 76°FHi: 24°C | Lo: 45°FLo: 7°C | Hi: 80°FHi: 27°C Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C Lo: 46°FLo: 8°C | Hi: 80°FHi: 27°C Lo: 45°FLo: 7°C | Hi: 80°FHi: 27°C Lo: 45°FLo: 7°C |
| POP: 30% | POP: 30% |
POP = Probability of Precipitation.
Weather Outlook Updated: 239 AM PDT Thu Sep 17 2026 
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Issued: 259 AM PDT Thu Sep 17 2026
Key Messages
- Showers and thunderstorms again today. Main risk is lightning, but also gusty erratic outflow winds (40-45 mph), especially Cascades eastward this afternoon/evening. Daytime temperatures remaining below normal.
- Showers and thunderstorms diminish tonight with just isolated activity lingering over far east side Friday morning.
- Temperatures warm Friday through the weekend getting back above normal Saturday and Sunday.
- Signal for dry weather and seasonable temperatures continues for next...