High pressure will dominate for the first half of the work week, bringing mostly sunny skies across Pennsylvania on Monday and Tuesday with temperatures in the seventies during the day. This high pressure system will move out of the region on Wednesday as a cold front passes through the Commonwealth. Overcast skies and periods of rain will first impact western Pennsylvania starting Wednesday morning then move across the Commonwealth, exiting the region by the middle of the day on Thursday. High temperatures on Wednesday will be in the mid-seventies for most with high temperatures increasing on Thursday to the upper seventies and lower eighties. Friday will be mostly sunny and humid with many parts of Pennsylvania reaching the mid-eighties.