SXUS45 KMSO 082330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 505 PM MDT Fri May 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 in the evening then becoming partly cloudy. Lows around 50 . Variable winds up to 10 mph. Waves less than 1 foot. .SATURDAY...Sunny. Highs in the upper 60s. Variable winds up to 10 mph. Waves less than 1 foot. .SATURDAY NIGHT...Partly cloudy in the evening then becoming mostly cloudy. Lows around 50 . Variable winds up to 10 mph. Waves less than 1 foot. .SUNDAY...Mostly sunny. Highs around 70 . Variable winds up to 10 mph. Waves less than 1 foot.