SXUS45 KMSO 041230 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 605 AM MDT Mon May 4 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...Mostly sunny. Highs around 60 . North winds around 15 mph in the morning becoming light. Waves around 1 foot... locally up to 2 feet. .Tonight...Partly cloudy. Lows in the mid 40s. Variable winds up to 10 mph. Waves less than 1 foot. .TUESDAY...Mostly sunny. Highs in the upper 50s. Variable winds up to 10 mph. Waves less than 1 foot. .TUESDAY NIGHT...Mostly clear. Lows in the lower 40s. Variable winds up to 10 mph. Waves less than 1 foot. .WEDNESDAY...Sunny. Highs in the mid 60s. Variable winds up to 10 mph. Waves less than 1 foot.