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Long Island weather: Heat, humidity may affect the 4th

Sunny skies are expected on Monday with a

Sunny skies are expected on Monday with a high in the low 80s, forecasters said. Credit: News 12 Long Island

An expected stretch of humid and hotter-than-normal weather is arriving on the tail end of this week, and forecasters said it could impact the Fourth of July.

That’s as the Climate Prediction Center was showing an 80 to 90 percent probability of above-normal temperatures from Friday through next Wednesday for a big section of the Northeast, Long Island included. There are no calls yet as to just how much warmer.

Leading up to that, though, the Island on Tuesday and Wednesday should see sunny, then partly sunny skies, with high temperatures about five degrees below normal, the National Weather Service said. The normal high for those days at Long Island MacArthur Airport is 80 degrees.

A chances of showers enters the picture overnight Wednesday and through the day Thursday, the weather service said.

Look for a rise in humidity by Thursday, with those warmer temperatures building in as of Friday, said John Murray, weather service meteorologist in Upton.

As of Friday, “the main story becomes heat as a ridge [of high pressure] strengthens along the eastern U.S.,” the weather service said in its forecast discussion.

Friday was looking to warm up to around the mid to upper 80s, with temperatures increasingly trending higher for the following days, he said. Saturday was looking at some highs of around 90 degrees for closer in to the city, slightly warmer, still, for a broader area both Sunday and Monday. Temperatures on the East End, as is often the case, were expected to be several degrees cooler.

The prediction center, which is under the umbrella of the National Oceanic and Atmospheric Administration, was not saying just how much warmer conditions will be – just that the average of the daily temperatures for that stretch will almost certainly be coming in above the norm.

Looking at highs only, the average for that stretch at the airport is 80.8 degrees, said Jessica Spaccio, climatologist with the Northeast Regional Climate Center, based at Cornell University.

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