SXUS45 KMSO 082330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 505 PM MDT Thu Oct 8 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 then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows in the lower 50s. Variable winds up to 10 mph. Waves less than 1 foot. .FRIDAY...Breezy. Partly sunny. Highs in the mid 60s. Southwest winds 15 to 25 mph. Waves around 1 foot...locally up to 2 feet. .FRIDAY NIGHT...Mostly cloudy with a 50 percent chance of rain. Lows in the mid 40s. Southwest winds around 15 mph. Waves around 1 foot...locally up to 2 feet. .SATURDAY...Breezy, cooler. Partly sunny with a 50 percent chance of rain. Highs around 50 . Variable winds up to 10 mph becoming northeast 15 to 25 mph in the afternoon. Waves around 1 foot... locally up to 2 feet.