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Rainy Sunday, with pockets of steady rain at times across Long Island

Widespread flooding isn't likely, but localized downpours may cause localized minor issues in low lying, poor drainage spots.

Michele Powers

Sep 19, 2026, 5:33 PM

Updated

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Islip Information

Islip Information

Islip, New York • Climate data: Islip MacArthur Airport (ISP)
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Tonight

Temperatures will drop into the 50s to near 60 by Sunday morning, with increasing clouds and an east to southeast wind at 5 to 10 mph.

Sunday

Sunday will be a washout, but flash flooding is not to be expected. Rainfall totals will only reach about 1," slightly higher in a few isolated areas. A cooler breeze out of the southeast will develop. Light rain is likely in the morning, with a few pockets of steadier rain by the afternoon and evening. Most of these showers are just a nuisance but poor drainage spots and low lying areas may fill up with water with the heavier downpours.

Next week

The weather next week will be breezy, cool and fall-like. There is a risk of more rain, especially through the middle and late week period.

As the cold front drops south on Monday, things are trending a bit drier for the tri-state area. Rain showers are possible again Tuesday into Wednesday as a storm develops along the front and remains offshore.

There is a high level of uncertainty as of Saturday evening's forecast as to what happens after Wednesday with the coastal low. This will keep it breezy and cool. Depending on how close it is, there could be more rain involved. There could also be a threat of some coastal flooding. Check back with the News 12 Storm Watch Team for more guidance on how next week will shape up.

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