SXUS45 KMSO 062330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 505 PM MDT Wed May 6 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. A chance of thunderstorms in the evening, then a chance of showers and a slight chance of thunderstorms after midnight. Lows in the upper 40s. Variable winds up to 10 mph. Chance of precipitation 50 percent. Waves less than 1 foot. .THURSDAY...Partly sunny. A chance of rain in the morning, then a chance of showers and a slight chance of thunderstorms in the afternoon. Highs in the lower 60s. Variable winds up to 10 mph. Chance of precipitation 40 percent. Waves less than 1 foot. .THURSDAY NIGHT...Partly cloudy in the evening then becoming mostly cloudy. Lows in the upper 40s. Variable winds up to 10 mph. Waves less than 1 foot. .FRIDAY...Partly sunny. Highs in the mid 60s. Variable winds up to 10 mph. Waves less than 1 foot.