676 AWUS81 KCTP 300255 RWSCTP PAZ004>006-010>012-017>019-024>028-033>037-041-042-045-046- 049>053-056>059-063>066-301700- Regional Weather Summary National Weather Service State College PA 1055 PM EDT Mon Jun 29 2026 Heat and humidity will build over western Pennsylvania on Tuesday and expand throughout much of the Commonwealth by Wednesday. This heat and humidity will peak on Thursday and Friday across the Commonwealth with heat index values over 100 degrees across much of the area. A corridor of heat index values exceeding 105 degrees will be possible across portions of eastern Pennsylvania, where an Extreme Heat Watch is in effect. Low temperatures in this timeframe will allow for little relief from this heat later this week, with temperatures beginning to downtrend by the second half of the weekend. Showers and thunderstorms will be possible on Tuesday, especially across the northern tier of Pennsylvania along with higher elevation locations where a stray shower could pop up. Dry conditions are expected for most on Wednesday and Thursday, with the next chance for more widespread showers and thunderstorms possible on Friday and continuing into the weekend. Stay informed and take steps to protect yourself from heat related illness. Drink plenty of fluids and refrain from doing any strenuous activity in the sun during the peak heat of the day. $$