Rainy pattern for Long Island. Today and Thursday should be mostly dry, but we have to watch a line of strong thunderstorms for tomorrow evening. The image below is for 6 PM tomorrow, but they should weaken like they usually do as they get to Long Island. The rain may linger into Wednesday, but it's possible that Wednesday afternoon will be dry as well as Thursday. Friday and Saturday looks like rain, and it may last into Sunday morning or afternoon.
Image from weathermodels.com