Cooler temperatures hit Penn this weekend, but still in the 70s

With the official start of fall coming on Thursday, you'd expect temperatures to dip to more comfortable, sweater-like weather. 

If you're expecting highs in the 50s and 60s you might have to wait another month or so, but we will see even cooler temperatures than we saw during the week. Once again this week, highs rose into the 80s (and even upper-80s on Friday), but we won't be seeing the mercury get that high for a very long time. 

A cooler air mass from Canada will be invading the area for the weekend and we will start to see high's closer to normal without a cloud in the sky.