National Weather Service

News Headlines

High Risk of Rip Currents at Atlantic Ocean Beaches Through Monday

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

71°F

22°C

Humidity	94%
Wind Speed	SE 3 mph
Barometer	29.89 in (1012.0 mb)
Dewpoint	69°F (21°C)
Visibility	10.00 mi
Last update	24 Aug 10:56 pm EDT

More Information:

Local Forecast Office More Local Wx 3 Day History Hourly Weather Forecast

Extended Forecast for

Holtsville NY

Tonight
Low: 66 °F
Slight Chance
Showers and
Patchy Fog
Monday
High: 83 °F
Slight Chance
Showers and
Areas Fog
then Mostly
Sunny
Monday Night
Low: 63 °F
Mostly Clear
Tuesday
High: 80 °F
Sunny
Tuesday Night
Low: 61 °F
Partly Cloudy
Wednesday
High: 77 °F
Sunny
Wednesday Night
Low: 60 °F
Mostly Clear
Thursday
High: 79 °F
Mostly Sunny
Thursday Night
Low: 63 °F
Partly Cloudy

Detailed Forecast

Tonight

A 20 percent chance of showers after 2am. Patchy fog. Otherwise, mostly cloudy, with a low around 66. South wind around 5 mph becoming calm after midnight.

Monday

A 20 percent chance of showers before 11am. Areas of fog before 11am. Otherwise, mostly sunny, with a high near 83. Calm wind becoming southwest 5 to 9 mph in the morning.

Monday Night

Mostly clear, with a low around 63. Southwest wind 5 to 7 mph becoming northwest after midnight.

Tuesday

Sunny, with a high near 80. West wind 6 to 10 mph.

Tuesday Night

Partly cloudy, with a low around 61. West wind around 6 mph becoming north after midnight.

Wednesday

Sunny, with a high near 77.

Wednesday Night

Mostly clear, with a low around 60.

Thursday

Mostly sunny, with a high near 79.