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Sweet Grass, MT Weather Forecast

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Sweet Grass, MT Weather Forecast

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Sweet Grass MT weather - Partly Cloudy - 54°F
Partly Cloudy
54°F
Updated 10:36 am
Feels Like 53°F
Humidity 80%
Wind N 0 mph
Barometer  30.24 in
Dew Point 48°F
Sweet Grass MT weather - Partly Cloudy - 12°C
Partly Cloudy
12°C
Updated 10:36 am
Feels Like 12°C
Humidity 80%
Wind N 0 km/h
Barometer  102.4 kPa
Dew Point 9°C
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Sweet Grass Weather Forecast

REST OF TODAY TONIGHT SUNDAY SUNDAY NIGHT MONDAY MONDAY NIGHT TUESDAY WEDNESDAY THURSDAY THURSDAY NIGHT FRIDAY
Sweet Grass, MT Weather - Rest Of Today Sunny Sweet Grass, MT Weather - Tonight Mostly Clear Sweet Grass, MT Weather - Sunday Sunny Sweet Grass, MT Weather - Sunday Night Mostly Clear Sweet Grass, MT Weather - Monday Sunny Sweet Grass, MT Weather - Monday Night Mostly Clear Sweet Grass, MT Weather - Tuesday Mostly Clear Sweet Grass, MT Weather - Wednesday Partly Cloudy Sweet Grass, MT Weather - Thursday Partly Cloudy Sweet Grass, MT Weather - Thursday Night Chance Of Rain Sweet Grass, MT Weather - Friday Partly Sunny
Sunny Mostly Clear Sunny Mostly Clear Sunny Mostly Clear Mostly Clear Partly Cloudy Partly Cloudy Chance of Rain Partly Sunny
Hi: 69°FHi: 21°C
 Lo: 45°FLo: 7°C Hi: 71°FHi: 22°C
 Lo: 45°FLo: 7°C Hi: 75°FHi: 24°C
 Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C		 Hi: 71°FHi: 22°C
Lo: 49°FLo: 9°C		 Hi: 75°FHi: 24°C
Lo: 49°FLo: 9°C		 Hi: 75°FHi: 24°C
Lo: 49°FLo: 9°C		 Lo: 49°FLo: 9°C Hi: 69°FHi: 21°C
POP: 20%
POP = Probability of Precipitation.
Weather Outlook Updated: 1011 AM MDT Sat Sep 19 2026 Sweet Grass, MT Weather - WeatherWorld.com

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Sweet Grass Forecast Discussion

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Issued: 520 AM MDT Sat Sep 19 2026

Key Messages

  • Localized flooding possible in areas with moderate rainfall across parts of central and southwest Montana today.
  • Drier and warmer weather pattern develops for the upcoming week

Discussion

...
  • Meteorological Overview:

    • A vertically stacked mid-upper level low, centered over southern Idaho early this morning, will slowly track east into Wyoming through tonight while gradually weakening. This setup will sustain a deep, anomalously moist easterly flow across southwestern Montana today. Wides...