Today on Long Island will be partly cloudy this morning into early afternoon, and it will become increasingly cloudy by late afternoon. Temperatures will be close to 80 degrees. Showers are expected late tonight from around midnight into tomorrow morning around 7 AM. There should then be a break in the showers until mid-afternoon when more showers are expected with the cold front. Those showers should last until close to midnight.
Sunday and Monday will be really nice days with partly to mostly sunny skies and temperatures close to 80 degrees. A few showers are possible late Monday night into Tuesday morning. At this time, Wednesday and Thursday look to be really nice days as well with mostly sunny skies and temperatures in the low to mid 80's.
The following image is from the NAM model, and it's showing total rainfall expected through Sunday morning:
Image from tropicaltidbits.com