SXUS45 KMSO 112330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 405 PM MST Sun Jan 11 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 20 percent chance of rain early in the evening. Lows in the upper 30s. Variable winds up to 10 mph becoming south around 15 mph after midnight. Waves around 1 foot...locally up to 2 feet. .MONDAY...Mostly cloudy. A 20 percent chance of rain in the afternoon. Highs in the upper 40s. South winds around 15 mph. Waves around 1 foot...locally up to 2 feet. .MONDAY NIGHT...Mostly cloudy. A 20 percent chance of rain after midnight. Lows in the lower 40s. South winds around 15 mph in the evening becoming light. Waves around 1 foot...locally up to 2 feet. .TUESDAY...Cloudy. Highs around 50 . Variable winds up to 10 mph. Waves less than 1 foot.