Forecast

    Forecast for West Islip, NY | Forecast Periods: 14
    Monday
    Mar 16
    2026

    West Islip, NY

    Updated: 2:59 PM EDT

    55°F

    Areas Of Fog

    22 mph S
    Precipitation: 92%

    Areas of fog and showers and thunderstorms. Cloudy, with a high near 55. South wind around 22 mph, with gusts as high as 44 mph. Chance of precipitation is 90%. New rainfall amounts between a quarter and half of an inch possible.

    Hourly Forecast

    MON15:00
    55°F
    Areas Of Fog
    Dewpoint:10°Precip:92%Humidity:83%Wind:22 mph S
    MON16:00
    55°F
    Areas Of Fog
    Dewpoint:10°Precip:92%Humidity:83%Wind:22 mph S
    MON17:00
    55°F
    Areas Of Fog
    Dewpoint:10°Precip:92%Humidity:83%Wind:22 mph S
    MON18:00
    54°F
    Areas Of Fog
    Dewpoint:10°Precip:92%Humidity:86%Wind:22 mph S
    MON19:00
    53°F
    Areas Of Fog
    Dewpoint:10°Precip:92%Humidity:89%Wind:23 mph S
    TUE20:00
    52°F
    Areas Of Fog
    Dewpoint:10°Precip:99%Humidity:93%Wind:24 mph S
    TUE21:00
    52°F
    Areas Of Fog
    Dewpoint:10°Precip:99%Humidity:93%Wind:25 mph S
    TUE22:00
    52°F
    Areas Of Fog
    Dewpoint:10°Precip:99%Humidity:93%Wind:25 mph S
    TUE23:00
    52°F
    Areas Of Fog
    Dewpoint:10°Precip:98%Humidity:93%Wind:25 mph S
    TUE00:00
    51°F
    Areas Of Fog
    Dewpoint:8.9°Precip:98%Humidity:89%Wind:24 mph S
    TUE01:00
    48°F
    Areas Of Fog
    Dewpoint:7.2°Precip:98%Humidity:89%Wind:23 mph SW
    TUE02:00
    46°F
    Chance Rain Showers
    Dewpoint:5.6°Precip:38%Humidity:86%Wind:21 mph W
    TUE03:00
    44°F
    Chance Rain Showers
    Dewpoint:3.3°Precip:38%Humidity:79%Wind:20 mph W
    TUE04:00
    41°F
    Chance Rain Showers
    Dewpoint:1.1°Precip:38%Humidity:76%Wind:17 mph W
    TUE05:00
    39°F
    Mostly Cloudy
    Dewpoint:-0.6°Precip:1%Humidity:73%Wind:16 mph W
    TUE06:00
    37°F
    Mostly Sunny
    Dewpoint:-2.2°Precip:1%Humidity:70%Wind:15 mph W
    TUE07:00
    35°F
    Mostly Sunny
    Dewpoint:-3.9°Precip:1%Humidity:66%Wind:15 mph W
    TUE08:00
    34°F
    Sunny
    Dewpoint:-5°Precip:0%Humidity:64%Wind:15 mph W
    TUE09:00
    34°F
    Sunny
    Dewpoint:-6.1°Precip:0%Humidity:58%Wind:15 mph W
    TUE10:00
    35°F
    Sunny
    Dewpoint:-6.1°Precip:0%Humidity:56%Wind:16 mph W
    TUE11:00
    37°F
    Sunny
    Dewpoint:-6.1°Precip:0%Humidity:52%Wind:16 mph W
    TUE12:00
    38°F
    Sunny
    Dewpoint:-6.7°Precip:0%Humidity:48%Wind:16 mph W
    TUE13:00
    39°F
    Mostly Sunny
    Dewpoint:-6.7°Precip:0%Humidity:46%Wind:16 mph W
    TUE14:00
    41°F
    Mostly Sunny
    Dewpoint:-6.7°Precip:0%Humidity:43%Wind:16 mph W

    Extended Forecast

    Tonight

    Mon, Mar 16
    34°F
    Areas Of Fog
    16 mph SW
    Precipitation: 99%
    Areas of fog and showers and thunderstorms before 5am. Mostly cloudy. Low around 34, with temperatures rising to around 39 overnight. Southwest wind 16 to 25 mph, with gusts as high as 53 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.

    Tuesday

    Tue, Mar 17
    42°F
    Mostly Sunny
    16 mph W
    Precipitation: 1%
    Mostly sunny, with a high near 42. Wind chill values as low as 24. West wind around 16 mph, with gusts as high as 31 mph.

    Tuesday Night

    Tue, Mar 17
    25°F
    Mostly Clear
    9 mph W
    Precipitation: 0%
    Mostly clear. Low around 25, with temperatures rising to around 27 overnight. Wind chill values as low as 18. West wind 9 to 14 mph, with gusts as high as 25 mph.

    Wednesday

    Wed, Mar 18
    37°F
    Mostly Sunny
    5 mph W
    Precipitation: 0%
    Mostly sunny, with a high near 37. West wind 5 to 8 mph.

    Wednesday Night

    Wed, Mar 18
    30°F
    Partly Cloudy
    7 mph S
    Precipitation: 1%
    Partly cloudy. Low around 30, with temperatures rising to around 32 overnight.

    Thursday

    Thu, Mar 19
    44°F
    Partly Sunny
    5 mph S
    Precipitation: 1%
    Partly sunny, with a high near 44.

    Thursday Night

    Thu, Mar 19
    35°F
    Mostly Cloudy then Slight Chance Light Rain
    7 mph SW
    Precipitation: 16%
    A slight chance of rain after 2am. Mostly cloudy, with a low around 35.

    Friday

    Fri, Mar 20
    48°F
    Slight Chance Light Rain then Mostly Sunny
    6 mph SW
    Precipitation: 16%
    A slight chance of rain before 8am. Mostly sunny, with a high near 48.

    Friday Night

    Fri, Mar 20
    36°F
    Chance Light Rain
    12 mph SW
    Precipitation: 49%
    A chance of rain after 8pm. Mostly cloudy, with a low around 36. Chance of precipitation is 50%.

    Saturday

    Sat, Mar 21
    48°F
    Chance Light Rain
    14 mph W
    Precipitation: 49%
    A chance of rain. Partly sunny, with a high near 48. Chance of precipitation is 50%.

    Saturday Night

    Sat, Mar 21
    35°F
    Chance Light Rain
    16 mph SW
    Precipitation: 33%
    A chance of rain. Mostly cloudy, with a low around 35. Chance of precipitation is 30%.

    Sunday

    Sun, Mar 22
    47°F
    Chance Light Rain
    16 mph W
    Precipitation: 29%
    A chance of rain. Mostly cloudy, with a high near 47. Chance of precipitation is 30%.

    Sunday Night

    Sun, Mar 22
    32°F
    Chance Light Rain
    17 mph NW
    Precipitation: 25%
    A chance of rain. Mostly cloudy, with a low around 32.

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