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Thunder Lake Weather Forecast
| TODAY | TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT |
 |  |  |  |  | |  |  |  | | | |
| Chance of Showers | Mostly Cloudy | Increasing Clouds | Chance of T-Storm | Chance of T-Storm | Chance of T-Storm | Patchy Fog | Mostly Clear | Sunny | Mostly Clear | Sunny | Mostly Clear |
| Hi: 61°FHi: 16°C | Lo: 49°FLo: 9°C | Hi: 59°FHi: 15°C | Lo: 41°FLo: 5°C | Hi: 49°FHi: 9°C | Lo: 41°FLo: 5°C | Hi: 55°FHi: 13°C | Lo: 41°FLo: 5°C | Hi: 60°FHi: 16°C | Lo: 45°FLo: 7°C | Hi: 60°FHi: 16°C | Lo: 45°FLo: 7°C |
| POP: 20% | POP: 80% | POP: 100% | POP: 100% | POP: 60% |
POP = Probability of Precipitation.
Weather Outlook Updated: 350 AM MDT Thu Sep 17 2026 
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Issued: 112 AM MDT Thu Sep 17 2026
Key Messages
- Isolated to scattered showers and thunderstorms this afternoon and evening. Locally heavy rain possible over SE Montana with any showers/thunderstorms.
- A few strong thunderstorms are possible, mainly around and east of Billings Friday afternoon and evening.
- High chance for widespread precipitation Friday afternoon through the weekend, with the potential for locally heavy rainfall through Saturday night.
- Chance for at least half an inch of rainfall is greater than 70 percent across so...