The workweek begins under sunshine with pleasant conditions before converging systems bring the chance of showers Tuesday, the National Weather Service said.
High pressure builds Monday before moving off Long Island, creating "seasonable temperatures" and "pleasant weather," the service's Upton office said of Monday's forecast.
The potential for rain follows on Tuesday, most likely after the morning rush hour, as a warm front approaches from the south and a cold front moves across the area late Tuesday into Wednesday.
The chance of showers from Tuesday into early Wednesday ranges from 50 percent to 60 percent for most of Nassau and Suffolk counties, the service said.
Rainfall amounts are expected to be between one-tenth and one-quarter inch. Once the rain dissipates, conditions return to calm and clear for the remainder of the workweek, the service said.
Daytime temperatures Tuesday are in the mid 40s, with nighttime lows in the upper 30s. On Wednesday, once any rain clears by mid morning, partly sunny skies develop with daytime highs near 50.
Weather remains mainly dry Thursday through most of Saturday, the service said, but then the possibility of a rain/snow mix or even snow is forecast for Saturday night into Sunday.