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Lake Mason Weather Forecast
| TONIGHT | THURSDAY | THURSDAY NIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY |
 |  |  |  |  | | | |  |  | | |
| Mostly Clear | Sunny | Mostly Cloudy | Chance of Rain | Rain and Snow | Mostly Sunny | Mostly Clear | Sunny | Partly Cloudy | Partly Sunny | Mostly Cloudy | Rain/Snow Showers |
| Lo: 41°FLo: 5°C | Hi: 75°FHi: 24°C | Lo: 49°FLo: 9°C | Hi: 65°FHi: 18°C | Lo: 31°FLo: -1°C | Hi: 50°FHi: 10°C | Lo: 29°FLo: -2°C | Hi: 49°FHi: 9°C | Lo: 29°FLo: -2°C | Hi: 51°FHi: 11°C | Lo: 30°FLo: -1°C | Hi: 55°FHi: 13°C |
| POP: 70% | POP: 70% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 351 PM MDT Wed Oct 21 2026 
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Issued: 1240 PM MDT Wed Oct 21 2026
Key Messages
- Warm and Dry conditions through Thursday.
- Storm system late Thursday night into Saturday morning brings lower elevation rain and mountain snow; greatest totals forecast west of Billings, with little to no precipitation over SE Montana.
- Elevated Fire Weather Concerns Southeast Montana Friday afternoon-evening.
- Windy conditions (gusts 30-45 mph) expected Friday into Saturday.
- Seasonal temperatures (highs in the 50s) and unsettled conditions (20-40% precipitation chances) Sunday through...