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Johnson Lake, MT Weather Forecast
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Johnson Lake Weather Forecast
| TONIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY |
 |  |  |  |  | | | | |  |  | |
| Chance of T-Storm | Windy | Partly Cloudy | Mostly Sunny | Mostly Clear | Mostly Clear | Mostly Clear | Mostly Sunny | Chance of T-Storm | Chance of T-Storm | Chance of Showers | Chance of T-Storm |
| Lo: 60°FLo: 16°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 79°FHi: 26°C | Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Hi: 79°FHi: 26°C Lo: 51°FLo: 11°C | Hi: 81°FHi: 27°C | Lo: 59°FLo: 15°C | Hi: 85°FHi: 29°C | Lo: 55°FLo: 13°C | Hi: 81°FHi: 27°C |
| POP: 70% |
POP = Probability of Precipitation.
Weather Outlook Updated: 351 PM MDT Sun Aug 23 2026 
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Johnson Lake Forecast Discussion
Issued: 232 PM MDT Sun Aug 23 2026
Key Messages
- Severe thunderstorms begin this evening bringing strong winds, large hail, and heavy rainfall.
- Cold front tonight will bring gusty NW winds on Monday.
- Warm and dry conditions resume Tuesday as the western ridge rebounds.
Discussion
...
WEATHER PATTERN OVERVIEW: Upper ridge over eastern Montana overnight will move east today while an upper trough moves in from the Pacific NW tonight.
Showers and thunderstorms will move through the forecast area today as the ridge axis moves east and a wea...