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Chilly this morning with below average temperatures today on Long Island

You may need a jacket as you head out the door this morning.

Rich Hoffman

Sep 15, 2026, 5:34 AM

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Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
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It’s a chilly start to this Tuesday across Long Island, with morning temperatures ranging from the 40s to the middle-50s. Grab the sweatshirt or light jacket before heading out the door. The good news is we’ll have lots of sunshine and dry weather throughout the day, with just one or two passing clouds. Despite the sunshine, temperatures will remain on the cool side, with afternoon highs only around 70 degrees.

Long Island Today forecast

Tonight, sunset is around 7 p.m., followed by mostly clear skies and another cool night. Temperatures will quickly fall through the 60s during the evening, with overnight lows generally in the 50s. Some of the typically cooler locations, especially around the Pine Barrens, could once again dip into the 40s by early Wednesday morning.

Long Island tonight forecast

Wednesday brings another nice day, although we’ll start to see a few more clouds moving in during the afternoon. Expect a mixture of sunshine and clouds with temperatures recovering a bit into the 70s. Most of Wednesday stays dry, but we’ll be watching our next weather system as we head through the second half of the workweek. That could bring a chance of showers Thursday night into early Friday morning.

Looking ahead to the weekend, Saturday is shaping up to be the better day, with dry conditions expected. Sunday starts partly sunny, but some afternoon showers could develop, so keep that in mind if you have outdoor plans. Temperatures will be comfortable through the weekend, with highs generally in the 70s and some locations getting close to 80 degrees.

Long Island 10 day forecast

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