SXUS45 KMSO 092330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 506 PM MDT Mon Mar 9 2026 Note: The experimental wave height forecasts are representative of the mid lake waters and downwind shores. Wave heights may be significantly less on upwind shores. .Tonight...Breezy. Mostly cloudy with a 50 percent chance of snow. Lows around 30 . Southwest winds 15 to 25 mph. Waves 2 to 4 feet...locally up to 5 feet subsiding to around 1 foot... locally up to 2 feet late in the night. .TUESDAY...Breezy. Snow likely. Snow accumulation up to 1 inch. Highs in the upper 30s. Southwest winds 15 to 25 mph. Chance of snow 70 percent. Waves around 1 foot...locally up to 2 feet. .TUESDAY NIGHT...Partly cloudy with a slight chance of snow in the evening, then mostly cloudy with a chance of snow after midnight. Lows around 30 . Southwest winds around 15 mph. Chance of snow 40 percent. Waves 1 to 2 feet...locally up to 3 feet subsiding to around 1 foot...locally up to 2 feet in the late evening and overnight. .WEDNESDAY...Breezy. Snow in the morning, then snow and rain in the afternoon. Snow accumulation up to 1 inch. Highs in the lower 40s. Southwest winds 15 to 25 mph with gusts to around 30 mph. Chance of precipitation 90 percent. Waves around 1 foot...locally up to 2 feet building to 1 to 2 feet...locally up to 3 feet late in the afternoon.