Warm and increasingly humid weather settles across Long Island Monday night as summerlike heat continues through midweek. Tuesday and Wednesday will feel much warmer than normal, though ocean breezes may keep some shoreline communities slightly cooler than inland areas. Even so, many spots mid-island and in the North Shore could climb well into the 80s and near 90 by Wednesday afternoon.

Wednesday will bring the greatest chance for active weather across Long Island. A cold front moving through during the day and evening could spark scattered showers and thunderstorms, some capable of producing strong wind gusts, heavy downpours, and dangerous lightning. Travel delays and brief flooding in poor drainage areas are possible if stronger storms develop.

Much cooler air arrives across Long Island behind the front by Thursday. Temperatures will tumble nearly 15 to 20 degrees compared to Wednesday, with highs dropping back into the upper 60s and low 70s. The cooler weather is expected to last into the holiday weekend, along with increasing chances for occasional showers as a more unsettled pattern develops.

Anyone heading to the beaches, bays, or ocean waters this week should use extreme caution. Water temperatures remain in the 50s around Long Island, cold enough to quickly cause hypothermia if someone falls in unexpectedly. Boaters, paddleboarders, kayakers, and swimmers should be especially careful despite the warm air temperatures.