Weather WorldMcDonald Lake, MT Weather Forecast
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McDonald Lake Weather Forecast
| TODAY | TONIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY | WEDNESDAY NIGHT |
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| Chance of T-Storm | Mostly Cloudy | Mostly Cloudy | Chance of Rain | Chance of T-Storm | Rain | Chance of Rain | Partly Cloudy | Partly Cloudy | Partly Cloudy | Chance of Rain | Mostly Clear |
| Hi: 60°FHi: 16°C | Lo: 36°FLo: 2°C | Hi: 60°FHi: 16°C | Lo: 40°FLo: 4°C | Hi: 50°FHi: 10°C | Lo: 36°FLo: 2°C | Hi: 55°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 56°FHi: 13°C | Lo: 36°FLo: 2°C | Hi: 56°FHi: 13°C | Lo: 36°FLo: 2°C |
| POP: 50% | POP: 50% | POP: 90% | POP: 90% | POP: 40% | POP: 20% |
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM MDT Fri Sep 11 2026 
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Issued: 139 AM MDT Fri Sep 11 2026
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KEY MESSAGES:- Northeast winds Friday night through Saturday will create choppy conditions on area lakes.
- A cutoff low pressure system brings widespread rain, with snow above 6,000 feet Saturday night through Monday morning.
Showers and thunderstorms will continue over western MT through noon, these showers are powered by Jet Stream energy aloft. Afternoon showers will continue but mainly in the mountains east of US-93, orographic uplift will become the main instigator.
Friday evening ...