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A slight chill for Monday night with more sunshine and some warmer weather days this week for Long Island

It will not be too cold on Monday night, but have a jacket as temperatures will drop into the upper 40s for most of Long Island. Outdoor plans will feature sunshine for the rest of the week.

Matt Hammer

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Oct 26, 2026, 5:33 PM

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Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
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THIS EVENING AND OVERNIGHT

Pleasant weather continues this evening across Nassau and Suffolk Counties after a warmer day with high temperatures around 70. Temperatures are cooling through the 50s during the evening. Have a jacket or sweatshirt with you. The sky will stay mostly clear overnight, with low temperatures in the upper 40s across most of Long Island into early Tuesday morning.

MORE NICE WEATHER THIS WEEK

The stretch of dry weather will continue all week. While Tuesday and Wednesday will be more seasonable - in the upper 50s to low 60s - it warms up into the upper 60s to low 70s starting on Thursday. That warm-up will last through next week. Sunny skies will prevail through Saturday before more clouds and a few possible rain chances arrive next week.

HALLOWEEN PREVIEW

Halloween is looking pleasant as of Monday evening's forecast. You most likely will not even want a coat over any costumes while trick-or-treating. Expect a mix of sun and clouds, with temperatures in the 60s in the afternoon, cooling only into the upper 50s during the early evening.

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CLOCKS 'FALL BACK' THIS WEEKEND

Daylight saving time ends at 2 a.m. Sunday morning. This means we gain one extra hour this weekend as clocks go back 1 hour Sunday at 2 a.m. You can see how the sunrise and sunset times will change this weekend below.

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EXTENDED FORECAST

TONIGHT: Mostly clear. Chilly enough for a sweatshirt or jacket, but it will not feel too cold. Low temperatures will be in the upper 40s to near 50. Wind: West to north around 5 to 15 mph.

TUESDAY: Mostly sunny and cooler. Breezy at times too, with a wind out of the north to northeast around 5 to 15 mph. A few gusts will be near 20 mph. High temperatures will be seasonable - in the upper 50s to near 60. Much colder at night with areas of frost and some freezing conditions will be possible in and around the Pine Barrens and Hamptons. Lows will average around 35.

WEDNESDAY: Mostly sunny and seasonable. Highs around 60. Lows near 48.

THURSDAY: Mostly sunny and a bit warmer, with highs around 65. Lows near 52.

FRIDAY: Mostly sunny and warm, with highs around 71. Lows near 52.

SATURDAY: HALLOWEEN -- Sun and clouds. Highs around 66. Lows near 50.

SUNDAY: CLOCKS 'FALL BACK' AT 2 A.M. - Mostly cloudy, with highs around 65. Lows near 52.

MONDAY: Mostly cloudy, with a chance for scattered rain. Highs around 67. Lows near 50.

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