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Tunnel Lake Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | THURSDAY |
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| Chance of T-Storm | Chance of Showers | Chance of Showers | Partly Cloudy | Sunny | Mostly Clear | Mostly Clear | Partly Cloudy | Sunny | Partly Cloudy | Partly Cloudy | Partly Cloudy |
| Hi: 70°FHi: 21°C | Lo: 51°FLo: 11°C | Hi: 65°FHi: 18°C | Lo: 45°FLo: 7°C | Hi: 71°FHi: 22°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C | Hi: 75°FHi: 24°C Lo: 49°FLo: 9°C |
| POP: 20% | POP: 50% | POP: 50% |
POP = Probability of Precipitation.
Weather Outlook Updated: 326 AM MDT Fri Sep 18 2026 
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Issued: 515 AM MDT Fri Sep 18 2026
Key Messages
- Thunderstorms, a few of which look to be on the stronger side, develop through the day today, mostly across Central and Southwest Montana.
- Areas of precipitation continue into Saturday, resulting in increased concerns for localized flooding.
- A drier and warmer stretch looks to ensue late weekend through much of next week.
Discussion
... /Issued 324 AM MDT Fri Sep 18 2026/- Meteorological Overview:
A somewhat elongated upper level low across the Pacific NW and vicinity will slowly shift e...