Wednesday, a ridge of high-pressure building along the West Coast will aid in dry and hot conditions. Today, expect clear skies and hot temperatures; daytime highs will climb to the upper 80s and low 90s. Normally, we don't see 90-degree weather until mid to late June, but a few locations across the state will top out in the upper 80s and low 90s. Areas around the region could also set new daily record highs Wednesday, Thursday, and Friday.
Thursday will be the warmest day of the year in many locations. Daytime highs will climb to the upper 80s and 90s. With the temperatures continuing to warm up, that will cause an increase in snowmelt into area rivers, creeks, and streams. With that being said, keep in mind if recreating around rivers, lakes, and streams, the water temperature will remain cold. Also, isolated thunderstorm activity cannot be ruled out over the mountains of southwest Montana.
Friday, summer-like heat will still be with us. The high temperatures will remain above the seasonal average, and many locations high temperatures will remain in the 80s and 90s. A disturbance will move into the area and begin to break down the ridge of high pressure that helped temperatures climb this week. Scattered showers and thunderstorm activity will develop during the afternoon/evening. A few storms could become severe and produce damaging winds, hail, and heavy downpours.
Have a great day.