A Canadian storm system will impact western Montana through late Wednesday. The best chance of rain late Tuesday night and Wednesday will be across the northwest around Kalispell and Glacier Park. Showers may extend as far south as the Missoula area with only a slight chance in the southwest in Bozeman and Butte. Gusty winds will develop as the storm moves along the Canadian border. Lows in the 40s with highs Wednesday only in the 50s in Kalispell to the 60s in Missoula, Butte and Bozeman. Rainfall of a tenth to a half inch is possible from the Mission Valley north through the Flathead to the Canadian border.
The storm will move out of the region Wednesday night with clearing skies. That means it will be cold Thursday morning with lows dropping to freezing around Kalispell and Butte to a few degrees above freezing in Missoula and Bozeman.
Nice weather will return Thursday through the weekend. Sunny, warmer days and clear, chilly nights can be expected during this period. Lows in the 30s to lower 40s with highs in the upper 60s and 70s Friday and the 70s to around 80 Saturday and Sunday.