Dust off your rain gear.

It looks like Long Island is in for a drenching Monday night into Tuesday, said the National Weather Service.

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Before next week's possible drenching, however, the weather service is forecasting Saturday temperatures in the 70s across Long Island and a slight chance of rain on Sunday.

Forecasters are increasingly confident that moisture from a slow-moving cold front will merge with moisture from the remnants of tropical storm Karen, moving up from the Gulf of Mexico, said David Stark, weather service meteorologist based in Upton.

That could mean an inch or two of widespread rain, with a possible brief rainfall rate of at least an inch an hour, meaning the potential for fresh water flooding of low-lying poor drainage areas, the weather service said.

Though it's still too early to pin down timing, that could also mean a messy Tuesday morning commute, Stark said.

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October began with unseasonably warm weather, and September brought just 1.83 inches of rain -- 1.75 inches below normal -- according to the weather service.