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Arrow Lake, MT Weather Forecast
Arrow Lake, MT Weather Forecast Date: 336 AM MDT Thu Sep 10 2026
The area/counties/county of: Gallatin And Madison County Mountains And Centennial Mountains, including the cities of: Big Sky, West Yellowstone, Targhee Pass, and Raynolds Pass.or toggle through each period.
Today... Warmer, sunny. Highs 63 to 75. Southwest winds 5 to 20 mph. Gusts up to 30 mph increasing to 40 mph in the afternoon.
Tonight... Partly cloudy. Lows 41 to 47. Southwest winds 5 to 15 mph with gusts to around 35 mph.
Friday... Mostly sunny. Highs 60 to 70. Southwest winds up to 10 mph shifting to the west in the afternoon. Gusts up to 30 mph.
Friday Night... Partly cloudy in the evening then becoming mostly cloudy. Lows 36 to 42. North winds up to 15 mph. Gusts up to 35 mph Decreasing to 25 mph after midnight.
Saturday... Mostly sunny. Highs 59 to 71. East winds up to 5 mph shifting to the southwest 5 to 15 mph with gusts to around 40 mph in the afternoon.
Saturday Night... Mostly cloudy. Slight chance of rain in the evening, then chance of rain after midnight. Lows 37 to 43. Chance of rain 50%.
Sunday... Mostly cloudy. Chance of rain and snow in the morning, then rain showers, snow showers likely and slight chance of thunderstorms in the afternoon. Light snow accumulations. Highs 47 to 57. Chance of precipitation 70%.
Sunday Night... Colder. Mostly cloudy. A 50% chance of rain showers and snow showers in the evening. Lows 28 to 34.
Monday... Mostly sunny. Highs 46 to 56.
Monday Night... Mostly clear. Lows 29 to 35. Highs 51 to 61.
Tuesday... Mostly clear. Lows 29 to 35. Highs 51 to 61.
Tuesday Night... Partly cloudy. Lows 34 to 40. Highs 51 to 61.
POP = Probability of Precipitation
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