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.

Mostly Cloudy

73°F

23°C

Humidity 87%
Wind Speed W 5 mph
Barometer 29.91 in (1012.6 mb)
Dewpoint 69°F (21°C)
Visibility 10.00 mi
Last update 10 Aug 9:56 pm EDT
Extended Forecast for

Terryville NY

  • Tonight

    Tonight: A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 73. West wind around 7 mph.

    Low: 73 °F

    Slight Chance
    Showers then
    Partly Cloudy

  • Tuesday

    Tuesday: Mostly sunny, with a high near 89. West wind 7 to 9 mph.

    High: 89 °F

    Mostly Sunny

  • Tuesday Night

    Tuesday Night: Mostly cloudy, with a low around 69. Southwest wind around 5 mph becoming light and variable.

    Low: 69 °F

    Mostly Cloudy

  • Wednesday

    Wednesday: Mostly cloudy, then gradually becoming sunny, with a high near 86. North wind around 6 mph becoming northwest in the afternoon.

    High: 86 °F

    Decreasing
    Clouds

  • Wednesday Night

    Wednesday Night: Partly cloudy, with a low around 70. Southwest wind 3 to 5 mph.

    Low: 70 °F

    Partly Cloudy

  • Thursday

    Thursday: A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 86.

    High: 86 °F

    Mostly Sunny
    then Chance
    Showers

  • Thursday Night

    Thursday Night: A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 69.

    Low: 69 °F

    Chance
    Showers then
    Mostly Cloudy

  • Friday

    Friday: Mostly sunny, with a high near 82.

    High: 82 °F

    Mostly Sunny

  • Friday Night

    Friday Night: Mostly clear, with a low around 62.

    Low: 62 °F

    Mostly Clear

Detailed Forecast

Tonight
A 20 percent chance of showers before 11pm. Partly cloudy, with a low around 73. West wind around 7 mph.
Tuesday
Mostly sunny, with a high near 89. West wind 7 to 9 mph.
Tuesday Night
Mostly cloudy, with a low around 69. Southwest wind around 5 mph becoming light and variable.
Wednesday
Mostly cloudy, then gradually becoming sunny, with a high near 86. North wind around 6 mph becoming northwest in the afternoon.
Wednesday Night
Partly cloudy, with a low around 70. Southwest wind 3 to 5 mph.
Thursday
A 40 percent chance of showers after 2pm. Mostly sunny, with a high near 86.
Thursday Night
A 30 percent chance of showers before 8pm. Mostly cloudy, with a low around 69.
Friday
Mostly sunny, with a high near 82.
Friday Night
Mostly clear, with a low around 62.
Saturday
Sunny, with a high near 80.
Saturday Night
Partly cloudy, with a low around 64.
Sunday
A 30 percent chance of showers. Mostly sunny, with a high near 80.
Sunday Night
A 50 percent chance of showers. Mostly cloudy, with a low around 66.
Monday
A 40 percent chance of showers. Partly sunny, with a high near 81.
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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:
7:57 pm EDT Aug 10, 2026
Forecast Valid:
10pm EDT Aug 10, 2026-6pm EDT Aug 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