Long Islanders can expect perfect weather Sunday and a repeat performance for Monday’s Fourth of July celebrations with showers possible late at night, forecasters said.

News 12 meteorologist Bruce Avery said the “lovely holiday” conditions Sunday are due to a dry air mass that’s producing “lots of sunshine, summerlike humidity and temperatures into the 80s.”

Avery predicted temperatures of 84 for Wantagh and Baldwin, 82 for Coram and Kings Park, and 79 in Patchogue and on the East End in Montauk, East Hampton and Southold.

The UV Index will be very high on Sunday, but there were no boating advisories, according to the News 12 forecast.

Pat Maloit, a meteorologist for the National Weather Service in Upton, said lows Sunday night will be “generally in the lower to mid-60s.”

Maloit said Monday will bring a return of Sunday’s temperatures and that it will be another sunny, dry day — but with a chance there might be a damper put on late-night fireworks displays.

“Showers are likely after midnight and there’s a chance of thunderstorms, but in Nassau County they could come a little sooner — around 10 or 11 o’clock,” Maloit said.

Tuesday will be mostly cloudy with another chance of showers or thunderstorms between 6 a.m. and noon.

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“The showers will come to an end after that but we’ll keep the clouds all day,” Maloit said. “The highs will be mainly in the lower to mid-80s and the lows at night will be in the mid- to upper 60s and dry.”

Wednesday will be dry and sunny with highs in the mid-80s and lows in the upper 60s.

The sun sticks around for Thursday when highs will reach near 84 with lows near 70.

Friday it will be mostly sunny again but another chance of a thunderstorm is expected to start the weekend. Lows Friday will be near 69.