Weather WorldHaystack Mountain Trail, MT Weather Forecast
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Haystack Mountain Trail Weather Forecast
| TONIGHT | FRIDAY | FRIDAY NIGHT | SATURDAY | SATURDAY NIGHT | SUNDAY | SUNDAY NIGHT | MONDAY | MONDAY NIGHT | TUESDAY | TUESDAY NIGHT | WEDNESDAY |
 |  | | |  | | | | | | | |
| Patchy Fog | Mostly Sunny | Patchy Fog | Mostly Sunny | Mostly Clear | Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny | Mostly Clear | Mostly Sunny |
| Lo: 36°FLo: 2°C | Hi: 66°FHi: 19°C | Lo: 40°FLo: 4°C | Hi: 66°FHi: 19°C | Lo: 40°FLo: 4°C | Hi: 75°FHi: 24°C | Lo: 40°FLo: 4°C | Hi: 75°FHi: 24°C | Lo: 40°FLo: 4°C | Hi: 70°FHi: 21°C | Lo: 36°FLo: 2°C | Hi: 70°FHi: 21°C |
POP = Probability of Precipitation.
Weather Outlook Updated: 206 PM MDT Thu Oct 01 2026 
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Issued: 102 PM MDT Thu Oct 1 2026
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KEY MESSAGES:- Warming and drying trend Friday through Sunday; cool/cold valley lows with patchy frost.
- Westerly winds increase Friday afternoon and Monday with passing disturbances.
Zonal flow aloft will yield to a building high-pressure ridge across the Northern Rockies Friday through Saturday. This will initiate a warming and drying trend, with daytime high temperatures rising roughly 10 to 15 degrees (or more) above seasonal averages this weekend. Strong nocturnal radiational cool...