National Oceanic and Atmospheric Administration National Weather Service United States Department of Commerce

Hazardous Weather Conditions

Current conditions at

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Mostly Cloudy

75°F

24°C

Humidity 94%
Wind Speed Calm
Barometer 30.08 in (1018.5 mb)
Dewpoint 73°F (23°C)
Visibility 10.00 mi
Last update 15 Jul 7:56 am EDT
Extended Forecast for

Islip Terrace NY

  • Today

    Today: A 40 percent chance of showers and thunderstorms, mainly before 11am. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. Light south wind increasing to 5 to 9 mph in the morning.

    High: 83 °F

    Chance
    Showers and
    Patchy Fog
    then Slight
    Chance
    T-storms

  • Tonight

    Tonight: Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 73. South wind 5 to 7 mph becoming calm after midnight.

    Low: 73 °F

    Patchy Fog

  • Wednesday

    Wednesday: Patchy fog before 9am. Otherwise, mostly sunny, with a high near 86. Heat index values as high as 97. Light west wind becoming south 6 to 11 mph in the morning.

    High: 86 °F

    Patchy Fog
    then Mostly
    Sunny

  • Wednesday Night

    Wednesday Night: A 50 percent chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 74. Southwest wind 6 to 8 mph.

    Low: 74 °F

    Chance
    T-storms

  • Thursday

    Thursday: A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind 7 to 13 mph.

    High: 88 °F

    Chance
    Showers then
    Chance
    T-storms

  • Thursday Night

    Thursday Night: A chance of thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.

    Low: 76 °F

    Chance
    T-storms then
    Partly Cloudy

  • Friday

    Friday: A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89.

    High: 89 °F

    Mostly Sunny
    then Chance
    T-storms

  • Friday Night

    Friday Night: A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71.

    Low: 71 °F

    Chance
    T-storms then
    Partly Cloudy

  • Saturday

    Saturday: Mostly sunny, with a high near 84.

    High: 84 °F

    Mostly Sunny

Detailed Forecast

Today
A 40 percent chance of showers and thunderstorms, mainly before 11am. Patchy fog before 9am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 83. Light south wind increasing to 5 to 9 mph in the morning.
Tonight
Patchy fog after 11pm. Otherwise, partly cloudy, with a low around 73. South wind 5 to 7 mph becoming calm after midnight.
Wednesday
Patchy fog before 9am. Otherwise, mostly sunny, with a high near 86. Heat index values as high as 97. Light west wind becoming south 6 to 11 mph in the morning.
Wednesday Night
A 50 percent chance of showers and thunderstorms, mainly after 8pm. Mostly cloudy, with a low around 74. Southwest wind 6 to 8 mph.
Thursday
A 30 percent chance of showers and thunderstorms. Partly sunny, with a high near 88. Southwest wind 7 to 13 mph.
Thursday Night
A chance of thunderstorms before 8pm. Partly cloudy, with a low around 76. Chance of precipitation is 30%.
Friday
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 89.
Friday Night
A 30 percent chance of showers and thunderstorms before 8pm. Mostly cloudy, with a low around 71.
Saturday
Mostly sunny, with a high near 84.
Saturday Night
Mostly cloudy, with a low around 71.
Sunday
A 40 percent chance of showers. Partly sunny, with a high near 84.
Sunday Night
A 30 percent chance of showers. Mostly cloudy, with a low around 71.
Monday
A 30 percent chance of showers. Partly sunny, with a high near 84.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Islip Terrace NY
 40.75°N 73.18°W (Elev. 30 ft)
Last Update:
6:03 am EDT Jul 15, 2025
Forecast Valid:
8am EDT Jul 15, 2025-6pm EDT Jul 21, 2025
 
Forecast Discussion
 
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Additional Resources

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Hourly Weather Forecast

National Digital Forecast Database

National Digital Forecast Database Maximum Temperature Forecast

High Temperature

National Digital Forecast Database Weather Element Forecast

Chance of Precipitation