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Lake Alva, MT Weather Forecast

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Lake Alva, MT Weather Forecast

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Lake Alva MT weather - Clear - 62°F
Clear
62°F
Updated 9:39 pm
Feels Like 49°F
Humidity 57%
Wind N 0 mph
Barometer  29.97 in
Dew Point 47°F
Lake Alva MT weather - Clear - 17°C
Clear
17°C
Updated 9:39 pm
Feels Like 10°C
Humidity 57%
Wind N 0 km/h
Barometer  101.4 kPa
Dew Point 8°C
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Lake Alva Weather Forecast

TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY
Lake Alva, MT Weather - Tonight Mostly Clear Lake Alva, MT Weather - Tuesday Partly Cloudy Lake Alva, MT Weather - Tuesday Night Clearing Lake Alva, MT Weather - Wednesday Mostly Sunny Lake Alva, MT Weather - Wednesday Night Partly Cloudy Lake Alva, MT Weather - Thursday Partly Cloudy Lake Alva, MT Weather - Thursday Night Partly Cloudy Lake Alva, MT Weather - Friday Chance Of Rain Lake Alva, MT Weather - Friday Night Chance Of Rain Lake Alva, MT Weather - Saturday Partly Cloudy Lake Alva, MT Weather - Saturday Night Mostly Cloudy Lake Alva, MT Weather - Sunday Mostly Cloudy
Mostly Clear Partly Cloudy Clearing Mostly Sunny Partly Cloudy Partly Cloudy Partly Cloudy Chance of Rain Chance of Rain Partly Cloudy Mostly Cloudy Mostly Cloudy
Lo: 45°FLo: 7°C Hi: 75°FHi: 24°C
 Lo: 45°FLo: 7°C Hi: 70°FHi: 21°C
 Lo: 46°FLo: 8°C Hi: 76°FHi: 24°C
 Lo: 46°FLo: 8°C Hi: 66°FHi: 19°C
 Lo: 36°FLo: 2°C Hi: 56°FHi: 13°C
 Lo: 36°FLo: 2°C Hi: 60°FHi: 16°C
POP: 20% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 1223 PM MDT Mon Sep 21 2026 Lake Alva, MT Weather - WeatherWorld.com

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Lake Alva Forecast Discussion

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Issued: 102 PM MDT Mon Sep 21 2026

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KEY MESSAGES:
  • Summer-like conditions this week
  • Chance for showers/thunderstorms in Lemhi County and southwest Montana on Tuesday
  • Cold front Friday to bring a change: showers and thunderstorms, gusty winds, then cooler, fall-like conditions this weekend.
  • Frosty mornings to follow this weekend into early next week.

It will be a gorgeous week as temperatures rise into the 70s and 80s across the region, which will generally be 10 to 15 degrees above average for late September.

A low press...