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 — Thunderstorms

Thunderstorms possible. Expect reduced visibility and standing water on roadways.

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Active Weather Alerts 1 active

Moderate

Heat Advisory

Heat Advisory issued August 10 at 3:35AM EDT until August 10 at 7:00PM EDT by NWS Upton NY

▶ Full description

* WHAT...Heat index values up to 98. * WHERE...Northern Nassau, Northwest Suffolk, Southern Nassau, and Southwest Suffolk Counties. * WHEN...Until 7 PM EDT this evening. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses.

Area: Northwest Suffolk; Southwest Suffolk; Northern Nassau; Southern Nassau Expires: Mon, Aug 10, 7:00 PM ET

Nassau County OKX 33,37

Today 88°F

Mostly Sunny then Slight Chance Showers And Thunderstorms

Wind: 3 to 12 mph SE 59% precip

▶ Details

A slight chance of showers and thunderstorms between 2pm and 5pm, then showers and thunderstorms likely. Mostly sunny, with a high near 88. Heat index values as high as 95. Southeast wind 3 to 12 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

Tonight 76°F

Showers And Thunderstorms Likely then Partly Cloudy

Wind: 12 mph SW 59% precip

▶ Details

Showers and thunderstorms likely before 11pm. Partly cloudy, with a low around 76. Southwest wind around 12 mph. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch possible.

Tuesday 87°F

Mostly Sunny

Wind: 12 mph W 12% precip

▶ Details

Mostly sunny, with a high near 87. West wind around 12 mph.

Tuesday Night 74°F

Partly Cloudy

Wind: 7 to 12 mph NW 11% precip

▶ Details

Partly cloudy, with a low around 74. Northwest wind 7 to 12 mph.

Wednesday 84°F

Mostly Sunny

Wind: 5 to 9 mph E 11% precip

▶ Details

Mostly sunny, with a high near 84. East wind 5 to 9 mph.

Wednesday Night 74°F

Partly Cloudy then Slight Chance Rain Showers

Wind: 9 mph W 24% precip

▶ Details

A slight chance of rain showers after 2am. Partly cloudy, with a low around 74.

Thursday 86°F

Slight Chance Rain Showers

Wind: 7 to 13 mph W 24% precip

▶ Details

A slight chance of rain showers before 2pm. Mostly sunny, with a high near 86.

Thursday Night 72°F

Slight Chance Rain Showers

Wind: 13 mph NW 15% precip

▶ Details

A slight chance of rain showers between 8pm and 2am. Partly cloudy, with a low around 72.

Friday 82°F

Mostly Sunny

Wind: 9 to 13 mph NW 9% precip

▶ Details

Mostly sunny, with a high near 82.

Friday Night 69°F

Partly Cloudy

Wind: 10 to 14 mph N 8% precip

▶ Details

Partly cloudy, with a low around 69.

Suffolk County OKX 55,35

Forecast data unavailable.

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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: Aug 10, 12:36 PM ET.