Offshore nor'easter continues to bring gusty winds, minor beach erosion and coastal flooding to Long Island

Dry weather with a gusty winds makes highs near 60 feel cooler. Minor coastal flooding between 3 p.m. and 9 p.m.

Rich Hoffman

•

Oct 21, 2026, 6:58 AM

•

Updated

Islip Information

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

Updating...

🌅

Sunrise

Islip

🌇

Sunset

Islip

☀️

UV Index Today

🌙

Moon Phase

Tonight

🍃

Air Quality

🌡️

Average High / Low

-- / --

1991-2020 Normals

ISP Climate

🏆

Record High / Low

-- / --

ISP Climate

Loading latest Islip information...

It's another breezy and chilly day across Long Island, with a mixture of sunshine and clouds. We'll see more sunshine across Nassau County and western Suffolk County, while the East End will have more clouds throughout the day. The big weather story continues to be the gusty northeast winds, with gusts of 30 to 40 mph, especially along the shoreline and across eastern Suffolk County. Afternoon temperatures will climb into the upper 50s and lower 60s, but the gusty winds will make it feel cooler. You'll definitely want a jacket if you're heading outdoors.

We're also keeping an eye on the coastline this afternoon and evening. A Coastal Flood Advisory is in effect for southern Nassau County and southwestern Suffolk County from 3 p.m. to 9 p.m. Minor coastal flooding is possible around the time of high tide, especially in low-lying and flood-prone shoreline communities. Some roads near the waterfront could experience minor flooding. Waves 5 to 10 feet along the South Shore will lead to beach erosion. Tonight, skies will be partly cloudy and temperatures will drop into the 40s. It will remain breezy, with wind gusts of 25 to 35 mph adding to the overnight chill.

Thursday brings plenty of sunshine across Long Island, but we're not quite done with the gusty winds. Expect another breezy day, with occasional wind gusts of 30 to 35 mph and afternoon highs in the upper 50s and lower 60s.

By Friday, we'll finally start to see those winds ease, but temperatures will turn a little cooler. Expect mostly sunny skies with highs generally in the 50s. Friday night will be noticeably colder, with partly cloudy skies and temperatures dropping into the 30s, especially across the Pine Barrens and normally colder inland communities. If you're heading to a Friday night football game or enjoying some outdoor Halloween activities, you'll definitely want to bundle up.

Good news for everyone taking part in Saturday's Jones Beach Ironman 70.3! The weather is looking dry for the race, although it will be a chilly start, with morning temperatures in the 40s. The biggest improvement will be the winds, which will be much lighter than what we've been dealing with during the week. Northerly winds in the morning will gradually shift to the southwest during the afternoon, generally around 5 to 15 mph. That's welcome news for the athletes, especially those competing along the exposed shoreline and on the cycling course. Sunshine will be with us through much of the day, with a few afternoon clouds and high temperatures climbing into the 50s. Overall, it looks like a nice fall day for the race, with dry weather and much more manageable winds.

The rest of the weekend is shaping up nicely across Long Island. Sunday will feature mostly sunny skies, dry conditions and temperatures rebounding into the upper 50s and lower 60s. After several days of gusty winds and chilly weather, we'll finally enjoy a calmer stretch of fall weather. Whether you're heading to a fall festival, picking pumpkins or spending time outdoors with the family, both Saturday and Sunday are looking good. The bottom line: A windy and chilly finish to the workweek gives way to a dry, quieter and more comfortable weekend across Long Island.

Here is a look at the projected hour-by-hour weather for Long Island:

The offshore storm is also bringing rough surf along the South Shore. Waves will build to around 5 to 10 feet, creating high surf and the potential for some minor beach erosion. Coastal communities, especially along the South Shore and East End, should keep an eye on conditions as we head through the middle of the week.