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Loon Lake, MT Weather Forecast

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Loon Lake, MT Weather Forecast

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Loon Lake MT weather - Clear - 69°F
Clear
69°F
Updated 2:26 pm
Feels Like 64°F
Humidity 48%
Wind SSW 6 mph
Barometer  29.95 in
Dew Point 49°F
Loon Lake MT weather - Clear - 21°C
Clear
21°C
Updated 2:26 pm
Feels Like 18°C
Humidity 48%
Wind SSW 10 km/h
Barometer  101.4 kPa
Dew Point 9°C
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Loon Lake Weather Forecast

TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT MONDAY
Loon Lake, MT Weather - Tonight Partly Cloudy Loon Lake, MT Weather - Wednesday Partly Cloudy Loon Lake, MT Weather - Wednesday Night Mostly Cloudy Loon Lake, MT Weather - Thursday Partly Cloudy Loon Lake, MT Weather - Thursday Night Partly Cloudy Loon Lake, MT Weather - Friday Chance Of Rain Loon Lake, MT Weather - Friday Night Chance Of Rain Loon Lake, MT Weather - Saturday Chance Of Rain Loon Lake, MT Weather - Saturday Night Partly Cloudy Loon Lake, MT Weather - Sunday Mostly Cloudy Loon Lake, MT Weather - Sunday Night Mostly Cloudy Loon Lake, MT Weather - Monday Mostly Cloudy
Partly Cloudy Partly Cloudy Mostly Cloudy Partly Cloudy Partly Cloudy Chance of Rain Chance of Rain Chance of Rain Partly Cloudy Mostly Cloudy Mostly Cloudy Mostly Cloudy
Lo: 45°FLo: 7°C Hi: 70°FHi: 21°C
 Lo: 45°FLo: 7°C Hi: 76°FHi: 24°C
 Lo: 46°FLo: 8°C Hi: 70°FHi: 21°C
 Lo: 36°FLo: 2°C Hi: 56°FHi: 13°C
 Lo: 36°FLo: 2°C Hi: 60°FHi: 16°C
 Lo: 36°FLo: 2°C Hi: 60°FHi: 16°C
POP: 50% POP: 50% POP: 40%
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 PM MDT Tue Sep 22 2026 Loon Lake, MT Weather - WeatherWorld.com

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Loon Lake Forecast Discussion

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Issued: 1240 PM MDT Tue Sep 22 2026

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KEY MESSAGES:
  • Unseasonable warmth through the rest of the week, with scattered afternoon thunderstorms in Southwest Montana and Lemhi County today.
  • Cold front Friday brings widespread gusty winds, transitioning to a much cooler, breezy, and showery weekend.

Unseasonably warm and mostly dry conditions will persist across the Northern Rockies today, with valley temperatures running 10 to 15 degrees above seasonal averages. An upper-level shortwave lifting northeastward will interact wi...