Cloudy skies eventually will give way to a warm, mostly sunny Saturday, including for the Belmont Stakes, when American Pharoah goes for horse-racing's Triple Crown.
The National Weather Service's Upton office said fans headed to Belmont Park for the race shouldn't worry.
"It'll clear out this afternoon and be just fine at race time," said Faye Barthold, a meteorologist at Upton.
Gradual clearing and 70-degree temperatures emerge, with light north northeast wind from 7 to 10 mph.
News 12 Long Island meteorologist Matt Hammer said there's a "chance a brief, isolated shower falls early this afternoon, but otherwise conditions will definitely start improving greatly."
Showers popped up over parts of Nassau and Suffolk counties early Saturday, some before dawn. And Barthold said a second round would move in about 9 a.m., dropping in from the Hudson Valley.
The service said skies should be mostly clear by 2 p.m., in plenty of time for the race in Elmont; post time is 6:50 p.m.
"Track conditions should be nice and dry with mostly sunny skies and temperatures still around the low 70s," Hammer said.
American Pharoah is trying to become the first Triple Crown winner since Affirmed in 1978.
The rest of the weekend also is expected to be mostly sunny with 70-degree temperatures before another threat of showers Monday night into Tuesday.
Saturday night is mostly clear with lows in the 50s and slightly lower in the pine barrens, Hammer said.
He called Sunday "a full day of sunshine" with highs around 70.