High pressure from the southwest helped clear conditions after a rainy, somewhat windy Thursday morning, the National Weather Service said.
Steady rain greeted morning commuters, mostly because of a cold front crawling across the region.
Rain fell steadily, especially in Suffolk County, before skies started to clear from west to east shortly after noon, according to the service.
Flood advisories were issued for each county, expiring in Suffolk at 12:45 p.m. and in Nassau at 8:45 a.m.
As of shortly after 1 p.m., 1.1 inches of rain had fallen at Long Island MacArthur Airport, according to the weather service.
Meteorologist Lauren Nash in the service's Upton office said the slow-moving cold front pulled in moisture from the south, adding to the increased rain.
Some rain lingered over eastern Long Island into midafternoon, the service said.
But low pressure lifting through the region will create cooler, drier air, starting Thursday night.
The result still will be slightly warmer than normal temperatures for Friday and Saturday -- in the high 60s and low 70s, almost 10 degrees above normal.
Winds are expected to be out of the west and southwest, between 7 and 13 mph, although some gusty winds could develop later Friday afternoon.