Long Island Weather — Alerts & Forecast

Official NWS alerts and forecasts for Nassau and Suffolk County. Live observations from MacArthur Airport (KISP).

Current Conditions — KISP / Islip MacArthur Airport

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Road Impact: High — Heavy Rain

Heavy rain expected. Wet roads and reduced visibility — increase following distance.

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Active Weather Alerts 2 active

Minor

Coastal Flood Advisory

Coastal Flood Advisory issued September 28 at 5:01AM EDT until September 28 at 2:00PM EDT by NWS Upton NY

▶ Full description

* WHAT...Up to one foot of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...Southwest Suffolk and Southern Nassau Counties. * WHEN...Until 2 PM EDT this afternoon. * IMPACTS...Minor to locally moderate flooding in vulnerable locations near the waterfront and shoreline. Some roads and low lying properties including parking lots, parks, lawns, and homes and businesses with basements near the waterfront will experience minor flooding.

Area: Southwest Suffolk; Southern Nassau Expires: Mon, Sep 28, 1:15 PM ET
Minor

Coastal Flood Advisory

Coastal Flood Advisory issued September 28 at 5:01AM EDT until September 28 at 3:00PM EDT by NWS Upton NY

▶ Full description

* WHAT...One to two feet of inundation above ground level expected in vulnerable areas near the waterfront and shoreline. * WHERE...In Connecticut, Southern Fairfield and Southern New Haven Counties. In New York, Southern Westchester, Bronx, Northwest Suffolk, Northern Queens and Northern Nassau Counties. * WHEN...From 11 AM this morning to 3 PM EDT this afternoon. * IMPACTS...Minor flooding in the more vulnerable locations near the waterfront and shoreline. Some roads and low lying properties including parking lots, parks, lawns, and homes and businesses with basements near the waterfront will experience minor flooding.

Area: Southern Fairfield; Southern New Haven; Southern Westchester; Bronx; Northwest Suffolk; Northern Queens; Northern Nassau Expires: Mon, Sep 28, 1:15 PM ET

Nassau County OKX 33,37

Today 64°F

Rain Showers

Wind: 12 to 20 mph N 78% precip
▶ Details

Rain showers before 2pm. Mostly cloudy, with a high near 64. North wind 12 to 20 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.

Tonight 59°F

Mostly Cloudy

Wind: 7 to 12 mph NW 8% precip
▶ Details

Mostly cloudy, with a low around 59. Northwest wind 7 to 12 mph.

Tuesday 71°F

Mostly Sunny

Wind: 7 mph NW 3% precip
▶ Details

Mostly sunny, with a high near 71. Northwest wind around 7 mph.

Tuesday Night 61°F

Mostly Cloudy

Wind: 5 mph NW 1% precip
▶ Details

Mostly cloudy, with a low around 61. Northwest wind around 5 mph.

Wednesday 73°F

Mostly Sunny

Wind: 2 to 6 mph W
▶ Details

Mostly sunny, with a high near 73. West wind 2 to 6 mph.

Wednesday Night 64°F

Partly Cloudy

Wind: 8 mph S
▶ Details

Partly cloudy, with a low around 64.

Thursday 77°F

Mostly Sunny

Wind: 6 to 10 mph SW
▶ Details

Mostly sunny, with a high near 77.

Thursday Night 67°F

Partly Cloudy

Wind: 13 mph SW 1% precip
▶ Details

Partly cloudy, with a low around 67.

Friday 76°F

Mostly Sunny

Wind: 10 mph SW 13% precip
▶ Details

Mostly sunny, with a high near 76.

Friday Night 62°F

Slight Chance Rain Showers

Wind: 10 mph NW 20% precip
▶ Details

A slight chance of rain showers after 8pm. Partly cloudy, with a low around 62.

Suffolk County OKX 55,35

Forecast data unavailable.

Data: National Weather Service (weather.gov). Nassau grid OKX/33,37 · Suffolk grid OKX/55,35 · Alert zones NYZ077–NYZ080, NYZ179. Observations from KISP (MacArthur Airport). Forecast updated each build: Sep 28, 8:09 AM ET.