SXUS45 KMSO 022330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 406 PM MST Mon Feb 2 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...Cloudy. A 20 percent chance of rain in the evening. Lows around 40 . Variable winds up to 10 mph. Waves less than 1 foot. .TUESDAY...Mostly cloudy. Highs in the mid 40s. Variable winds up to 10 mph. Waves less than 1 foot. .TUESDAY NIGHT...Mostly cloudy. Lows around 40 . Variable winds up to 10 mph. Waves less than 1 foot. .WEDNESDAY...Mostly cloudy. Highs in the upper 40s. Variable winds up to 10 mph. Waves less than 1 foot.