A flash flood watch was canceled Monday evening after expected heavy rain did not materialize, according to the National Weather Service.

The watch, which initially had covered all of Long Island, was drawn back to Suffolk County Monday afternoon before it was canceled at 5:50 p.m. Monday, said Matthew Tauber, a meteorologist with the service’s Upton bureau.

“We’re still expecting light rain,” Tauber said, adding that it “should be tapering off” by 11 p.m. or midnight, and ending after 2 a.m. or 3 a.m. Tuesday.

The rainfall total at Islip for Monday was 0.18 inches, he said.

Lows on Monday are expected to be in the mid- to upper 60s.

Tuesday will be mostly dry, with a slight chance of some showers or an isolated thunderstorm between 10 a.m. and 2 p.m., Tauber said.

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Highs Tuesday will be around 80.

Meanwhile, a small craft advisory remained in effect for the waters off the South Shore of Long Island Monday.

The advisory, which warns of sustained winds or gusts that could be hazardous to small boats, was in effect through 6 a.m. Tuesday for the South Shore bays between Jones Inlet and Shinnecock Bay, and Sandy Hook, New Jersey to Fire Island Inlet out 20 nautical miles.

It was in effect for Fire Island Inlet to Moriches Inlet until noon Tuesday, and from Moriches Inlet to Montauk Point until 3 p.m. Tuesday.