Friday should start the weekend on a promising note, as the National Weather Service’s Upton office predicts at least partly sunny skies with a high around 83 degrees.

But Saturday, when the weather service sees a 50 percent chance of showers and thunderstorms, might be a better day for indoor chores than the beach or the golf course. The high should match Friday’s level of 83 degrees.

NWS meteorologist Carlie Buccola pinned the forecast for a rainy Saturday on the arrival of a new front from the Midwest.

Sunday, however, which should be sunny with a high around 80 degrees, could mark a return to what has been — so far at least — a classic Long Island summer, with the mean temperatures just slightly higher than normal, Buccola said.

June’s mean temperature was 67.7 degrees, Buccola said. That is 0.3 degrees above normal.

July’s mean was 75 degrees, which works out to 1.1 higher than normal, she said.

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As for the rest of August, the weather service’s models are tied.

“There is no signal on whether the rest of August will be cooler or warmer; there are just even chances” for either outcome, she said.

The workweek might start on a soggy note, with a 40 percent chance of showers and thunderstorms on Monday, according to the weather service. That could help restrain the temperature from rising above 78 degrees.

Clouds will linger through Tuesday, when the high could reach 82 degrees, but they should retreat in time for a mostly sunny Wednesday, when the thermometer could climb to 80 degrees. On Thursday, however, the clouds should be back, with the temperature remaining tolerable with a high of about 81 degrees, the NWS said.