Grassy Lake Weather Forecast, MT

Today 12 Mar Gallatin and Madison County Mountains and Centennial Mountains

Very windy. Not as cool. Mostly cloudy. Slight chance of snow in the Morning, then chance of snow and rain in the afternoon. Patchy blowing snow through the day. Visibility one quarter mile or less at Times. Highs 34 to 46. Southwest Winds 25 to 35 Mph shifting to the west 25 to 45 Mph in the afternoon. Gusts up to 85 Mph. Chance of precipitation 50 percent.

Tonight 12 Mar Gallatin and Madison County Mountains and Centennial Mountains

Windy. Mostly cloudy with a 50 percent chance of snow. Patchy blowing snow in the evening. Patchy blowing snow after midnight. Visibility one quarter mile or less at Times in the evening. Lows 26 to 32. West Winds 15 to 30 Mph with Gusts to around 75 Mph.

Fri 13 Mar Gallatin and Madison County Mountains and Centennial Mountains

Windy. Mostly cloudy. Chance of snow in the Morning, then chance of snow and rain in the afternoon. Highs 35 to 45. Southwest Winds 15 to 30 Mph with Gusts to around 60 Mph. Chance of precipitation 50 percent.

Fri 13 Mar Gallatin and Madison County Mountains and Centennial Mountains

Breezy. Snow and rain likely in the Evening, then snow likely after midnight. Moderate snow Accumulations. Lows 27 to 33. Southwest Winds 10 to 25 Mph. Gusts up to 55 Mph decreasing to 40 Mph after midnight. Chance of precipitation 70 percent.

Sat 14 Mar Gallatin and Madison County Mountains and Centennial Mountains

Windy, snow. Heavy snow Accumulations. Highs 32 to 42. Southwest Winds 10 to 20 Mph with Gusts to around 45 Mph increasing to west 20 to 30 Mph with Gusts to around 65 Mph in the afternoon. Chance of snow near 100 percent.

Sat 14 Mar Gallatin and Madison County Mountains and Centennial Mountains

Breezy. Much Colder. Mostly cloudy. Snow likely in the Evening, then chance of snow after midnight. Moderate snow Accumulations. Lows 7 to 13. Chance of snow 70 percent.

Sun 15 Mar Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy. Slight chance of snow in the Morning, then chance of snow in the afternoon. Highs 21 to 31. Chance of snow 40 percent.

Sun 15 Mar Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy with a 50 percent chance of snow. Lows 18 to 24.

Mon 16 Mar Gallatin and Madison County Mountains and Centennial Mountains

Not as cool. Cloudy. Chance of snow in the Morning, then chance of snow and rain in the afternoon. Highs 36 to 46. Chance of precipitation 50 percent.

Mon 16 Mar Gallatin and Madison County Mountains and Centennial Mountains

Mostly cloudy. Chance of snow and slight chance of rain in the Evening, then slight chance of rain and snow after midnight. Lows 30 to 38. Chance of precipitation 40 percent.

Tue 17 Mar Gallatin and Madison County Mountains and Centennial Mountains

Warmer. Partly cloudy. Highs 46 to 58. Lows 32 to 40.

Tue 17 Mar Gallatin and Madison County Mountains and Centennial Mountains

Warmer. Partly cloudy. Highs 46 to 58. Lows 32 to 40.

Wed 18 Mar Gallatin and Madison County Mountains and Centennial Mountains

Not as cool. Mostly sunny. Highs 52 to 64.

Wed 18 Mar Gallatin and Madison County Mountains and Centennial Mountains

Partly cloudy. Highs 52 to 66. Lows 36 to 44.

Grassy Lake Weather Forecast

Today 12 Mar Gallatin and Madison County Mountains and Centennial Mountains

Tonight 12 Mar Gallatin and Madison County Mountains and Centennial Mountains

Fri 13 Mar Gallatin and Madison County Mountains and Centennial Mountains

Fri 13 Mar Gallatin and Madison County Mountains and Centennial Mountains

Sat 14 Mar Gallatin and Madison County Mountains and Centennial Mountains

Sat 14 Mar Gallatin and Madison County Mountains and Centennial Mountains

Sun 15 Mar Gallatin and Madison County Mountains and Centennial Mountains

Sun 15 Mar Gallatin and Madison County Mountains and Centennial Mountains

Mon 16 Mar Gallatin and Madison County Mountains and Centennial Mountains

Mon 16 Mar Gallatin and Madison County Mountains and Centennial Mountains

Tue 17 Mar Gallatin and Madison County Mountains and Centennial Mountains

Tue 17 Mar Gallatin and Madison County Mountains and Centennial Mountains

Wed 18 Mar Gallatin and Madison County Mountains and Centennial Mountains

Wed 18 Mar Gallatin and Madison County Mountains and Centennial Mountains

Temperature Forecast NOAA

Temperature Real-Time

Pocatello/Idaho Falls Radar

National Satellite

National Synoptic

Grassy Lake Temperature Statistics

March Temperature

Ennis - Big Sky Airport (11.2 miles)

Lowest 23 January, 2026

Average 2026

Highest 5 February, 2026

Lowest 19 February, 2026

Average February

Highest 5 February, 2026

Lowest 3 March, 2026

Average March

Highest 8 March, 2026

Climate (2021–Present)

Ennis - Big Sky Airport (11.2 miles)

Average Low 2021–2026

Average 2021–2026

Average High 2021–2026