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Cool temperatures, sunny skies today on Long Island

It will be a dry and seasonably cool work week, but a coastal storm will bring a risk for beach erosion later this week.

Alex Calamia

•

Oct 18, 2026, 12:48 PM

•

Updated

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Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
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WHAT TO KNOW:

  • Ample sunshine is expected today with temperatures only in the 50s

  • Clouds increase Monday

  • Coastal storm stays off shore, but brings windy weather midweek

  • No significant rain is in the forecast for the next 10 days

TODAY

Abundant sunshine is expected all day, but high temperatures will remain in the low 50s, well below average for this time of the year. Winds are calm so the sunshine will feel very warm. Bring the layers, it will feel surprisingly cold in shade!

TONIGHT

Temperatures drop into the 40s after sunset with mostly clear skies and a light wind from the east. Temperatures will remain above 40 overnight. Freezing temperatures are not in the forecast.

MONDAY

Sunny and chilly to start, then mostly cloudy in the afternoon. Morning lows in the 40s, afternoon highs climb to the low 60s. The wind will shift to the northeast at 10 mph.

MIDWEEK COASTAL STORM

A large coastal storm is expected to remain well offshore during the middle of the week, but there will be impacts. Windy weather and more clouds are expected for Tuesday and Wednesday. Coastal erosion is expected on the Atlantic.

The risk for rain Wednesday and Thursday is low, but this forecast could change if the storm tracks closer. At this time, that is not expected.

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