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Corvallis, MT Weather Forecast

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Corvallis, MT Weather Forecast

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Corvallis MT weather - Clear - 46°F
Clear
46°F
Updated 1:29 am
Feels Like 50°F
Humidity 93%
Wind SSE 5 mph
Barometer  30.01 in
Dew Point 44°F
Corvallis MT weather - Clear - 8°C
Clear
8°C
Updated 1:29 am
Feels Like 10°C
Humidity 93%
Wind SSE 8 km/h
Barometer  101.6 kPa
Dew Point 7°C
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Corvallis Weather Forecast

TODAY TONIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT SUNDAY SUNDAY NIGHT
Corvallis, MT Weather - Today Partly Cloudy Corvallis, MT Weather - Tonight Clearing Corvallis, MT Weather - Wednesday Mostly Sunny Corvallis, MT Weather - Wednesday Night Partly Cloudy Corvallis, MT Weather - Thursday Mostly Sunny Corvallis, MT Weather - Thursday Night Partly Cloudy Corvallis, MT Weather - Friday Chance Of Rain Corvallis, MT Weather - Friday Night Chance Of Rain Corvallis, MT Weather - Saturday Partly Cloudy Corvallis, MT Weather - Saturday Night Partly Cloudy Corvallis, MT Weather - Sunday Mostly Cloudy Corvallis, MT Weather - Sunday Night Chance Of Rain
Partly Cloudy Clearing Mostly Sunny Partly Cloudy Mostly Sunny Partly Cloudy Chance of Rain Chance of Rain Partly Cloudy Partly Cloudy Mostly Cloudy Chance of Rain
Hi: 76°FHi: 24°C
 Lo: 47°FLo: 8°C Hi: 77°FHi: 25°C
 Lo: 47°FLo: 8°C Hi: 83°FHi: 28°C
 Lo: 50°FLo: 10°C Hi: 77°FHi: 25°C
 Lo: 43°FLo: 6°C Hi: 60°FHi: 16°C
 Lo: 36°FLo: 2°C Hi: 63°FHi: 17°C
 Lo: 40°FLo: 4°C
POP: 20% POP: 50% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 1222 AM MDT Tue Sep 22 2026 Corvallis, MT Weather - WeatherWorld.com

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Corvallis 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...