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St Ignatius, MT Weather Forecast

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St Ignatius, MT Weather Forecast

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St Ignatius MT weather - Clear - 44°F
Clear
44°F
Updated 8:53 am
Feels Like 46°F
Humidity 85%
Wind N 0 mph
Barometer  30.16 in
Dew Point 40°F
St Ignatius MT weather - Clear - 7°C
Clear
7°C
Updated 8:53 am
Feels Like 8°C
Humidity 85%
Wind N 0 km/h
Barometer  102.1 kPa
Dew Point 4°C
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St Ignatius Weather Forecast

TODAY TONIGHT TUESDAY TUESDAY NIGHT WEDNESDAY WEDNESDAY NIGHT THURSDAY THURSDAY NIGHT FRIDAY FRIDAY NIGHT SATURDAY SATURDAY NIGHT
St Ignatius, MT Weather - Today Patchy Fog St Ignatius, MT Weather - Tonight Mostly Clear St Ignatius, MT Weather - Tuesday Mostly Cloudy St Ignatius, MT Weather - Tuesday Night Partly Cloudy St Ignatius, MT Weather - Wednesday Mostly Sunny St Ignatius, MT Weather - Wednesday Night Partly Cloudy St Ignatius, MT Weather - Thursday Mostly Cloudy St Ignatius, MT Weather - Thursday Night Mostly Cloudy St Ignatius, MT Weather - Friday Chance Of Rain St Ignatius, MT Weather - Friday Night Chance Of Rain St Ignatius, MT Weather - Saturday Mostly Cloudy St Ignatius, MT Weather - Saturday Night Partly Cloudy
Patchy Fog Mostly Clear Mostly Cloudy Partly Cloudy Mostly Sunny Partly Cloudy Mostly Cloudy Mostly Cloudy Chance of Rain Chance of Rain Mostly Cloudy Partly Cloudy
Hi: 75°FHi: 24°C
 Lo: 46°FLo: 8°C Hi: 75°FHi: 24°C
 Lo: 46°FLo: 8°C Hi: 70°FHi: 21°C
 Lo: 46°FLo: 8°C Hi: 75°FHi: 24°C
 Lo: 46°FLo: 8°C Hi: 66°FHi: 19°C
 Lo: 40°FLo: 4°C Hi: 60°FHi: 16°C
 Lo: 36°FLo: 2°C
POP: 40% POP: 30%
POP = Probability of Precipitation.
Weather Outlook Updated: 1223 AM MDT Mon Sep 21 2026 St Ignatius, MT Weather - WeatherWorld.com

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St Ignatius Forecast Discussion

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Issued: 200 AM MDT Mon Sep 21 2026

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KEY MESSAGES:
  • Chance for showers/thunderstorms in Lemhi County and southwest Montana on Tuesday
  • Warm, dry week ahead for the rest of the region.
  • Showers return late next week or early next weekend.

Satellite imagery early this morning shows dry air under a ridge of high pressure over the northwestern U.S. including the Northern Rockies. A closed circulation of low pressure is spinning over central California and moving inland. The ridge of high pressure will keep the Northern Rockies...