SXUS45 KMSO 101230 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 605 AM MDT Sun May 10 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. .Today...Partly sunny. Highs around 70 . Variable winds up to 10 mph. Waves less than 1 foot. .Tonight...Mostly cloudy. Lows in the lower 50s. Variable winds up to 10 mph. Waves less than 1 foot. .MONDAY...Sunny. Highs around 70 . Variable winds up to 10 mph. Waves less than 1 foot. .MONDAY NIGHT...Mostly clear. Lows around 50 . Variable winds up to 10 mph. Waves less than 1 foot. .TUESDAY...Sunny. Highs in the lower 70s. Variable winds up to 10 mph. Waves less than 1 foot.