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Mountain Trail Weather Forecast
| TODAY | TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | TUESDAY |
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| Sunny | Partly Cloudy | Mostly Cloudy | Clear | Sunny | Clear | Mostly Clear | Mostly Clear | Partly Cloudy | Mostly Clear | Mostly Clear | Mostly Clear |
| Hi: 66°FHi: 19°C | Lo: 55°FLo: 13°C | Hi: 79°FHi: 26°C | Lo: 55°FLo: 13°C | Hi: 76°FHi: 24°C | Lo: 56°FLo: 13°C | Hi: 87°FHi: 31°C Lo: 56°FLo: 13°C | Hi: 87°FHi: 31°C Lo: 56°FLo: 13°C | Hi: 76°FHi: 24°C | Hi: 81°FHi: 27°C Lo: 56°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 56°FLo: 13°C | Hi: 81°FHi: 27°C Lo: 56°FLo: 13°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 604 AM PDT Wed Sep 16 2026 
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Issued: 642 AM PDT Wed Sep 16 2026
Key Messages
Updated at 1230 AM PDT Wed Sep 16 2026- Cooler temperatures through Thursday
- Warming trend Friday into the weekend.
Aviation
... (12Z TAFS) Issued at 412 AM PDT Wed Sep 16 2026
Generally MVFR ceilings have developed across the region and are expanding into the interior valleys. Moderate confidence that LVK and SJC see ceilings at some point during the rest of the morning hours. Stratus will mix out rather late in the morning, with the coastal regions remaining socked in through the day. ...