Summer cold fronts often take their sweet time moving through the mid-Atlantic. That can mean advertised rain comes in later than expected and it takes longer to clear. Storms are possible this evening and overnight and - yes - well into Wednesday too. Humidity doesn’t appreciably drop until Thursday.
Through Tonight: Isolated storms are possible through rush hour, with the possibility of a more substantial line towards or just after sunset, especially in the northern suburbs. As I wrote earlier, a few storms could be severe, but the later storms arrive, the less likely they’re particularly violent. Outside of storms, it’s partly to mostly cloudy and mild, with lows in the upper 60s to low 70s (downtown).
Wednesday: The front continues its slow crawl through the region. That means we’ll have partly to mostly cloudy skies (not without some intervals of sunshine), moderate to high humidity, and a 40 percent chance of storms (best odds in the afternoon, but not out of the question in the morning). A few of the storms could be heavy especially along and southeast of I-95. Highs range from 85-89 (northwest to southeast).