This morning's balloon launch from the National Weather Service office on Long Island indicates that the lowest four miles or so of the atmosphere is saturated with moisture. When the air is that wet any little disturbance will produce rain and, wouldn't you know it, there's a small wave of low pressure crossing the city this morning. The rain will last through mid-afternoon with heaviest amounts, 1-2 inches, falling north of the city in the lower Hudson Valley and soutwestern Connecticut. We should warm to the upper 70s or even lower 80s once the rain eases up late this afternoon.
Tomorrow will be considerably warmer, with highs in the mid to upper 80s and plenty of humidity. Showers or stray thunderstorms are possible but drier air aloft will prevent prolonged heavy rains like today from happening.
A cold front will pass on Saturday night giving us pleasant weather on Sunday. We can look forward to a gentle northwesterly breeze, sunny skies and a high in the low 80s. Monday is looking much the same if just a bit warmer. Unsettled weather will return by the middle of next week.