SXUS45 KMSO 131230 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 505 AM MST Tue Jan 13 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 cloudy. A 20 percent chance of rain in the morning. Highs around 50 . Variable winds up to 10 mph. Waves around 1 foot...locally up to 2 feet. .Tonight...Mostly cloudy. Lows in the upper 30s. Variable winds up to 10 mph. Waves less than 1 foot. .WEDNESDAY...Mostly sunny. Highs in the lower 40s. Variable winds up to 10 mph. Waves less than 1 foot. .WEDNESDAY NIGHT...Partly cloudy. Lows in the lower 30s. Variable winds up to 10 mph. Waves less than 1 foot. .THURSDAY...Partly sunny. Highs in the lower 40s. Variable winds up to 10 mph. Waves less than 1 foot.