SXUS45 KMSO 152330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 505 PM MDT Wed Apr 15 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...Mostly cloudy. Rain likely and a chance of snow in the evening, then a slight chance of snow after midnight. Little or no snow accumulation. Lows in the lower 30s. Southwest winds around 15 mph. Chance of precipitation 70 percent. Waves around 1 foot...locally up to 2 feet. .THURSDAY...Snow likely in the morning, then a chance of snow showers and a slight chance of thunderstorms in the afternoon. Snow accumulation up to 1 inch. Highs around 40 . West winds around 15 mph in the morning becoming light. Chance of precipitation 70 percent. Waves around 1 foot...locally up to 2 feet. .THURSDAY NIGHT...Mostly cloudy. A chance of snow in the evening, then a slight chance of snow after midnight. Lows in the lower 30s. Variable winds up to 10 mph. Chance of snow 40 percent. Waves around 1 foot...locally up to 2 feet. .FRIDAY...Mostly cloudy. A chance of snow in the morning, then a chance of showers, snow showers and a slight chance of thunderstorms in the afternoon. Highs in the upper 40s. Variable winds up to 10 mph. Chance of precipitation 50 percent. Waves less than 1 foot.