Heavy rain's in the forecast, though it will probably hold off until overnight Tuesday or Wednesday morning.

There's also a chance of a thunderstorm Wednesday night, according to the National Weather Service in Upton.

A coastal flood advisory for Wednesday was issued by the service for the north and south shores of Nassau and western Suffolk. The advisory, in effect at high tide from 11 a.m. to 2 p.m., forecasts possible flooding in low-lying areas.

Forecasters predicted winds would pick up throughout Tuesday, with a chance of rain overnight into Wednesday morning.

One to 2 inches of rain are possible for Wednesday, forecasters said.

The heavy rain will fall in the afternoon and taper off some time overnight into Thursday, said Jay Engle, a meteorologist at the service's Upton office.

Winds of up to 20 mph also are possible, as are areas of fog on Wednesday night.

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By 7 a.m. Thursday, the rain will be history, Engle said.

"Drier air will push in quickly," he said.

Clearing skies are on tap for Thursday evening, with sunny skies predicted for Friday and for trick-or-treating on Saturday, meteorologists said.

Overnight lows are expected to be in the 40s much of the week, with highs in the 50s.

The exception should be Wednesday, forecasters said, when temperatures will remain in the 60s, and Thursday -- when a high of 70 degrees is possible.