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

73°F

23°C

Humidity 62%
Wind Speed N 7 mph
Barometer 29.89 in (1012.1 mb)
Dewpoint 59°F (15°C)
Visibility 10.00 mi
Last update 11 Sep 1:56 am EDT
Extended Forecast for

Terryville NY

  • Overnight

    Overnight: Mostly cloudy, with a low around 65. Light north wind.

    Low: 65 °F

    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 78. North wind 5 to 7 mph.

    High: 78 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 60. Calm wind.

    Low: 60 °F

    Mostly Clear

  • Saturday

    Saturday: Mostly sunny, with a high near 77. Light and variable wind becoming south 5 to 9 mph in the morning.

    High: 77 °F

    Mostly Sunny

  • Saturday Night

    Saturday Night: Showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. South wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.

    Low: 66 °F

    Mostly Cloudy
    then Showers
    Likely

  • Sunday

    Sunday: Showers likely before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.

    High: 79 °F

    Showers
    Likely

  • Sunday Night

    Sunday Night: Partly cloudy, with a low around 64.

    Low: 64 °F

    Partly Cloudy

  • Monday

    Monday: Mostly sunny, with a high near 75.

    High: 75 °F

    Mostly Sunny

  • Monday Night

    Monday Night: Partly cloudy, with a low around 58.

    Low: 58 °F

    Partly Cloudy

Detailed Forecast

Overnight
Mostly cloudy, with a low around 65. Light north wind.
Friday
Mostly sunny, with a high near 78. North wind 5 to 7 mph.
Friday Night
Mostly clear, with a low around 60. Calm wind.
Saturday
Mostly sunny, with a high near 77. Light and variable wind becoming south 5 to 9 mph in the morning.
Saturday Night
Showers likely and possibly a thunderstorm after 2am. Mostly cloudy, with a low around 66. South wind around 7 mph. Chance of precipitation is 70%. New rainfall amounts between a quarter and half of an inch possible.
Sunday
Showers likely before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 79. Chance of precipitation is 70%. New precipitation amounts between a half and three quarters of an inch possible.
Sunday Night
Partly cloudy, with a low around 64.
Monday
Mostly sunny, with a high near 75.
Monday Night
Partly cloudy, with a low around 58.
Tuesday
Sunny, with a high near 72.
Tuesday Night
Mostly clear, with a low around 61.
Wednesday
Sunny, with a high near 77.
Wednesday Night
Partly cloudy, with a low around 64.
Thursday
A 30 percent chance of showers. Mostly sunny, with a high near 77.
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Forecast Area
Tiles ©ESRI

ABOUT THIS FORECAST

 
Point Forecast:
Terryville NY
 40.91°N 73.06°W (Elev. 154 ft)
Last Update:
9:48 pm EDT Sep 10, 2026
Forecast Valid:
2am EDT Sep 11, 2026-6pm EDT Sep 17, 2026
 
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