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Stretch of wet & chilly weather arrives on Long Island starting Sunday

A great finish to the week, but a stretch of gloomy and chilly weather arrives starting Sunday.

Alex Calamia

Sep 18, 2026, 5:19 AM

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Islip Information

Islip Information

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

  • Stretch of cold and wet weather arrives on Sunday and lasts much of next week

  • Flash flooding is possible Sunday afternoon and evening.

  • The week ends with sunshine and dry weather

THIS MORNING

It's a warm and muggy start to the day with mostly cloudy skies and temperatures in the 60s and 70s for the morning commute. Rain is not expected this morning.

REST OF TODAY

It's a beautiful afternoon across the island with temperatures near 80 degrees and increasing sunshine. The humidity will drop a touch. Dinnertime plans look fantastic with temperatures in the 70s this evening.

SUNNY SATURDAY

Saturday is much cooler with temperatures near 60 in the morning and near 70 degrees in the afternoon. There will be an east breeze at 5-10 mph with a mix of sun and clouds.

SUNDAY SHOWERS

Sunday morning starts cool and cloudy with on and off showers. Rain will become more likely throughout the day. Heavy rain is possible Sunday afternoon and evening and flash flooding is possible. Temperatures are steady in the 60s.

GLOOMY NEXT WEEK

Cloudy, breezy, and chilly weather with on and off showers is expected to start off the week. Showers are possible each day, but sunshine is more likely to peek out later in the week. Morning temperatures are only in the 50s and afternoon highs remain in the 60s which is much cooler than average.

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