The end of Long Island’s workweek gets rising humidity levels, mostly sunny skies and high temperatures pushing toward 90 degrees, the National Weather Service said.

The temperature at Long Island MacArthur Airport was 88 around 2:20 p.m. — the highest so far for the day, said Joe Pollina, weather service meteorologist in Upton. Still, it was feeling more like 93, thanks to the humidity.

Farmingdale saw a temperature of 90 just before 2 p.m., but it felt more like 96.

The service’s Upton office said there’s a chance for isolated thunderstorms, some of which might generate heavy rain and gusty winds. While there’s a slight chance for storms to set up through this evening, the best chance — 40 percent to 50 percent — is around 9 p.m., Pollina said.

Friday also starts a string of hot days, with a heat wave possible, said News 12 Long Island meteorologist Bruce Avery. The weather service defines a heat wave as three straight days of 90 or above, and the next four days, including Monday, could see highs at or above 90 degrees, Avery said.

Given the uncomfortable and potentially harmful conditions, Nassau County police ask residents to check in on older and infirm neighbors as well as those family and friends. At the first sign of a potential medical emergency, go ahead and dial 911, said police, who also posted on their Facebook page a list of indicators of some heat-related medical conditions. That and tips on how to prevent dehydration, heatstroke, and heat exhaustion.

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Nassau County Executive Edward Mangano announced Friday that cooling centers will remain open to the public through the weekend.

The weather service also said that an air quality alert is in effect from 11 a.m. to 11 p.m. Friday for both Nassau and Suffolk counties.

The alert means the Air Quality Index for Long Island will surpass 100; index ratings higher than 100 mean levels of different air pollutants can have adverse health effects for those with respiratory issues, including asthma.

Also on Friday, the service said there’s a high risk for rip currents at Atlantic beaches through the evening hours.

Patchy fog is possible overnight, with clouds and southwest winds up to 15 mph.

The fog starts to lift after 8 a.m., the service said, giving way to mostly sunny conditions and highs close to 95 degrees.