Partly cloudy skies and scattered showers are forecast for Nassau and Suffolk counties, the National Weather Service said Thursday.
The service's Upton office said there's a 40 percent chance of rain during the day, dropping to 30 percent after 10 p.m. Thursday
Daily highs in the low to mid 70s are expected, with light south winds less than 10 mph.
News 12 Long Island meteorologist Rich Hoffman also said Thursday calls for cloudy skies, spotty showers and highs in the 70s.
Friday and Saturday look to be mostly dry and sunny, although there is a slight chance for showers before 9 a.m. Friday.
The bad news is that Sunday, Father's Day, could be a rainout.
"The remnants of tropical depression Bill could produce heavy rainfall on Sunday that could lead to flooding," the service said in a hazardous weather outlook.
Hoffman said daily highs on Friday will be near the mid 80s, after a morning of clouds and once again spotty showers. But the day should clear nicely, with overnight lows in the 60s.
On Saturday, temperatures cool slightly; the daily highs are expected in the mid to upper 70s.
An incoming cold front and the glancing blow from tropical depression Bill bring a 70 percent chance of Sunday rain, sometimes heavy.
"Sunday will be mostly cloudy with scattered showers and thunderstorms," Hoffman said. "We could have some periods of heavy rain," with highs ranging from 73 to 80 degrees.