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Clouds and fog giving way to partly sunny skies and humid weather

Temperatures will be above average during the week.

Rich Hoffman

Aug 17, 2026, 12:16 PM

Updated

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Islip Information

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Islip, New York
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Areas of clouds and fog will give way to partly sunny skies. I can’t completely rule out an isolated shower, but most of us will end the day much drier. High temperatures will reach the 80s, and you’ll notice a bit more humidity in the air.

Long Island Today forecast

For tonight, we’ll have partly to mostly cloudy skies with generally quiet weather. Some patchy fog could develop toward Tuesday morning, especially in the usual fog-prone locations. Overnight lows will settle into the upper 60s and lower 70s.

Long Island tonight forecast

Tuesday is looking like a nice summer day with mostly sunny skies and warm temperatures. Highs will climb into the mid-80s with a little humidity around. Wednesday looks good as well, with plenty of sunshine and temperatures around 86 degrees. It will be warmer and a bit more humid, with heat index values potentially approaching 90 degrees during the afternoon.

Changes arrive Thursday as clouds begin to increase. Expect partly sunny skies overall, but we’ll be tracking some showers and thunderstorms developing, especially during the afternoon. High temperatures will remain in the 80s. So, after this morning’s damp start, we have a stretch of warmer and mostly dry summer weather before our next chance of rain arrives Thursday.

FUTURECAST

Here is a look at the latest future radar for Long Island that shows the latest projection of the rain today and improving weather on the way.

BOAT AND BEACH

Rougher conditions for boaters today. This also includes a high risk of rip currents along the South Shore beaches through tonight. Anyone heading to the beach should check the latest rip current statements before getting in the water. Check out more of the local beach weather forecast and tides here.

Long Island Rip Currents

Long Island 10 day forecast

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