High pressure will build across the west Friday night into Saturday. This means ample sunshine and warmer temperatures can be expected this weekend. Parts of western Montana will see highs returning to the 80s on Saturday with mid to upper 70s for those who don't make it that high. A few isolated showers may develop along the divide this weekend, but overall expect the weather to be quite nice. Highs on Sunday will be even warmer, well into the 80s. Be sure to apply some sunscreen this weekend as burn time will be around 15 minutes for exposed skin in the middle of the day.
The warming trend continues early next week. Monday will be the warmest day with highs in the 80s, approaching 90 in some areas. As high pressure begins to break down on Monday in Oregon and Idaho, thunderstorms will develop and track toward Montana. Monday evening overnight into Tuesday will thus be a period of scattered showers and storms with some of those storms able to produce gusty winds and small hail.
For the remainder of the week expect temperatures to be average to below average (low to mid 70s) with a chance of showers each day. Winds will shift to come from the northwest which will limit the thunder threat to a few isolated bolts.