Soaring temperatures and humidity could affect high school graduations in the region as the start of summer is predicted to have a possible triple-digit heat index in some areas Wednesday and Thursday.

For both days, forecasters predict temperatures in the mid-90s for northern Nassau, with the lower 90s predicted for elsewhere on the Island -- especially the ocean-cooled South Shore. The heat index could make outdoor temperatures feel as hot as 100 in some areas, according to the National Weather Service.

Temperatures Tuesday are forecast to be in the 70s, with partly cloudy skies and light winds.

The records at Long Island MacArthur Airport in Ronkonkoma for those dates are 93 degrees. Forecasters predict temperatures will reach 90 degrees Wednesday there and 91 degrees on Thursday.

A slight chance of thunderstorms may offer relief on either day, and a heat advisory will likely be issued for New York City, officials said. Temperatures will be in the 70s at night on both days, officials said.

Residents should check in or call nearby shelters and community centers for water and cooling stations.

Officials advise that those who have to be outside -- such as parents and students at nearly a dozen high school graduations scheduled over those two days -- should wear hats and light clothing, and keep hydrated.

Joey Picca, meteorologist for the National Weather Service in Upton, said "Don't prolong your time outside, and find a shady spot to sit under," noting that consuming alcohol and caffeine will dehydrate people quickly.

The heat will hit New York City harder, with temperatures at LaGuardia Airport on Thursday expected to be 97 degrees, breaking the 96-degree mark set on that date in 1953, officials said.

Picca said temperatures across Long Island should cool over the weekend as a cold front passes.

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