Big Arm, MT Weather Forecast

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Big Arm, MT Weather Forecast

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Big Arm MT weather  - Clear - 41°F
Clear
41°F
Updated 10:41 pm
Feels Like 33°F
Humidity 54%
Wind N 14 mph
Barometer  30.15 in
Dew Point 26°F
Big Arm MT weather  - Clear - 5°C
Clear
5°C
Updated 10:41 pm
Feels Like 1°C
Humidity 54%
Wind N 23 km/h
Barometer  102.1 kPa
Dew Point -3°C

Big Arm Weather Forecast

TONIGHT MONDAY MONDAY NIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY
Big Arm, MT Weather - Tonight Mostly Cloudy Big Arm, MT Weather - Monday Mostly Cloudy Big Arm, MT Weather - Monday Night Rain And Snow Big Arm, MT Weather - Tuesday Snow Big Arm, MT Weather - Tuesday Night Rain Big Arm, MT Weather - Wednesday Rain And Snow Big Arm, MT Weather - Wednesday Night Rain And Snow Big Arm, MT Weather - Thursday Rain And Snow Big Arm, MT Weather - Thursday Night Rain And Snow Big Arm, MT Weather - Friday Chance Of Snow Big Arm, MT Weather - Friday Night Rain And Snow Big Arm, MT Weather - Saturday Mostly Cloudy
Mostly Cloudy Mostly Cloudy Rain and Snow Snow Rain Rain and Snow Rain and Snow Rain and Snow Rain and Snow Chance of Snow Rain and Snow Mostly Cloudy
Lo: 25°FLo: -4°C Hi: 50°FHi: 10°C
Lo: 26°FLo: -3°C Hi: 45°FHi: 7°C
Lo: 26°FLo: -3°C Hi: 46°FHi: 8°C
Lo: 25°FLo: -4°C Hi: 45°FHi: 7°C
Lo: 22°FLo: -6°C Hi: 45°FHi: 7°C
Lo: 21°FLo: -6°C Hi: 46°FHi: 8°C
POP: 90% POP: 90% POP: 70% POP: 80% POP: 80% POP: 40% POP: 30% POP: 20% POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 1228 PM MDT Sun Oct 25 2026 Big Arm, MT Weather - WeatherWorld.com

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Issued: 1247 PM MDT Sun Oct 25 2026

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KEY MESSAGES:
  • High pressure breaks down early Monday.
  • Colder temperatures and periods of rain and mountain snow expected this week.

A weak ridge of high pressure over the Northern Rockies will maintain dry conditions and seasonal temperatures through this afternoon. Patchy fog is possible Monday morning, but it is not expected to be as dense or widespread as Sunday morning`s fog.

A low pressure system will move into the Pacific Northwest on Monday. Rain and mountain snow from this sys...