While last night's rain for the metro area and much of the Northeast hit hard and locally caused areas of flooding in some areas, the entire event only lasted 6 hours for the NYC area and even less time as you go farther towards Boston (only 2 hours there). Below you can see the weather observations for NYC and when the rain happened. Surprisingly there was very little thunder and any lighting was cloud-to-cloud.
The cold front that swept through has lowered temperatures by around 5-7° from yesterday; not too bad but it's also 10° lower on average for the Northeast since Friday's "it's the last day of Summer so here's a hot day for you" day. I'm not sure if that's the technical term but I'll go with it.
So with the cold front passing through, high pressure will take over for the entire week. That's right, a week filled with sunshine. Not a bad way to start off the new season.