Monday will start with weather similar to Sunday — warm and sunny.
But as the day wears on, showers could move in, ahead of a cold front that will bring temperatures down to a somewhat more fall-like feel, the National Weather Service said.
Temperatures Tuesday will be "noticeably cooler," dropping to the 70s but still above average for late September.
Carlie Buccola, a meteorologist with the weather service's Upton office said: “By Tuesday, it will cool down for the rest of the week.”
Buccola said after Monday's expected rain, the rest of the week will be primarily dry.
Wednesday will see highs in the mid 70s with sunny skies. Thursday will see more clear skies but with temperatures approaching 80 degrees. Friday and Saturday will be mostly clear with highs in the mid 70s and lows in the mid 50s.