SXUS45 KMSO 092330 RECGPI Recreation Forecast for Flathead Lake National Weather Service Missoula MT 504 PM MDT Fri May 9 2025 .Tonight...Partly cloudy then becoming mostly cloudy late in the evening then becoming partly cloudy then becoming mostly cloudy late in the night. Lows in the lower 50s. Variable winds up to 10 mph. .SATURDAY...Breezy. Partly sunny. Highs around 80 . Variable winds up to 10 mph becoming south 15 to 20 mph with gusts to around 35 mph in the afternoon. .SATURDAY NIGHT...Mostly cloudy. A 20 percent chance of rain after midnight. Lows in the lower 50s. West winds around 15 mph with gusts to around 35 mph in the evening becoming light. .SUNDAY...Cooler. Mostly cloudy with a 50 percent chance of rain. Highs around 70 . Variable winds up to 10 mph.