With temperatures expected to hit 105 on Saturuday, the National Weather Service is keeping the Excessive Heat Warning in effect through the week.

NWS reports that this 10-day heat wave will probably break Sunday, but Saturday will have the highest temperatures yet, 105, triggering an Excessive Heat Watch for Friday and Saturday.

Today’s Fourth of July heat index will be around 100 this afternoon in Bucks and Montgomery Counties. There is a 30 percent chance of scattered thunderstorms this evening.

“Excessive heat” means that a prolonged period of dangerously hot temperatures will occur that could cause illness and dehydration.

Drink plenty of fluids and stay out of the sun.