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

Islip, Long Island Mac Arthur Airport (KISP)

Lat: 40.79°NLon: 73.1°WElev: 98ft.

Overcast

70°F

21°C

Humidity 79%
Wind Speed E 10 mph
Barometer 30.03 in (1016.9 mb)
Dewpoint 63°F (17°C)
Visibility 10.00 mi
Last update 17 Sep 5:56 pm EDT
Extended Forecast for

Farmingville NY

  • Tonight

    Tonight: Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 62. East wind 6 to 11 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.

    Low: 62 °F

    Showers
    Likely and
    Patchy Fog

  • Thursday

    Thursday: A 20 percent chance of showers before 11am. Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 78. Northeast wind around 6 mph.

    High: 78 °F

    Slight Chance
    Showers and
    Patchy Fog
    then Mostly
    Sunny

  • Thursday Night

    Thursday Night: Mostly clear, with a low around 62. Southwest wind 3 to 5 mph.

    Low: 62 °F

    Mostly Clear

  • Friday

    Friday: Sunny, with a high near 81. Northwest wind 5 to 7 mph.

    High: 81 °F

    Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 56. North wind 6 to 9 mph.

    Low: 56 °F

    Mostly Clear

  • Saturday

    Saturday: Sunny, with a high near 71.

    High: 71 °F

    Sunny

  • Saturday Night

    Saturday Night: Mostly clear, with a low around 52.

    Low: 52 °F

    Mostly Clear

  • Sunday

    Sunday: Mostly sunny, with a high near 70.

    High: 70 °F

    Mostly Sunny

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 57.

    Low: 57 °F

    Partly Cloudy

Detailed Forecast

Tonight
Showers likely and possibly a thunderstorm before 11pm, then a chance of showers. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 62. East wind 6 to 11 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Thursday
A 20 percent chance of showers before 11am. Patchy fog before 11am. Otherwise, cloudy through mid morning, then gradual clearing, with a high near 78. Northeast wind around 6 mph.
Thursday Night
Mostly clear, with a low around 62. Southwest wind 3 to 5 mph.
Friday
Sunny, with a high near 81. Northwest wind 5 to 7 mph.
Friday Night
Mostly clear, with a low around 56. North wind 6 to 9 mph.
Saturday
Sunny, with a high near 71.
Saturday Night
Mostly clear, with a low around 52.
Sunday
Mostly sunny, with a high near 70.
Sunday Night
Partly cloudy, with a low around 57.
Monday
Mostly sunny, with a high near 74.
Monday Night
Partly cloudy, with a low around 60.
Tuesday
Mostly sunny, with a high near 77.
Tuesday Night
Partly cloudy, with a low around 62.
Wednesday
Mostly sunny, with a high near 78.
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Forecast Area
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ABOUT THIS FORECAST

 
Point Forecast:
Farmingville NY
 40.84°N 73.05°W (Elev. 197 ft)
Last Update:
2:04 pm EDT Sep 17, 2025
Forecast Valid:
6pm EDT Sep 17, 2025-6pm EDT Sep 24, 2025
 
Forecast Discussion
 
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Additional Resources

Radar & Satellite Image

Link to Local Radar Data Link to Satellite Data

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