Breezy, chilly Saturday as cold air moves into Philadelphia region. Here's the weather forecast.

Cold air has settled into the Philadelphia region to bring some of the coldest air the area has had so far this fall. Temperatures in Philadelphia to start Saturday morning will be in the mid-30s, cold enough for areas of frost to develop through sunrise. As a result, a frost advisory is in effect until 9 a.m. The rest of the region will be even colder, with temperatures dipping into the low 30s to upper 20s.

The Details

CBS News Philadelphia

Areas that haven't already experienced their first freeze of the season so far will be under a freeze warning until 9 a.m. Sunday. After the morning chill and a little sunshine, temperatures will gradually make their way into the mid-to-upper 40s under a little more afternoon cloud cover. A brisk northwesterly wind, however, will keep temperatures feeling like the 30s for most of the afternoon.

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