National Weather Service Forecast for: Islip NY
Issued by: National Weather Service New York, NY
Updated: 6:32 pm EST Dec 16, 2025
 
Overnight

Overnight: Mostly clear, with a temperature rising to around 34 by 5am. Southwest wind 6 to 8 mph.
Mostly Clear
 Wednesday

Wednesday: Mostly sunny, with a high near 44. Southwest wind 10 to 15 mph, with gusts as high as 28 mph.
Mostly Sunny
 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 28. West wind 6 to 11 mph becoming light northwest after midnight. Winds could gust as high as 22 mph.
Mostly Clear
 Thursday

Thursday: Mostly sunny, with a high near 53. Light south wind increasing to 5 to 10 mph in the morning.
Mostly Sunny
 Thursday
Night
Thursday Night: Rain, mainly after 1am. Temperature rising to around 51 by 2am. South wind 8 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Chance Rain
then Rain
 Friday

Friday: Rain, mainly before 1pm. Temperature rising to near 54 by 10am, then falling to around 43 during the remainder of the day. Breezy. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Rain and
Breezy
 Friday
Night
Friday Night: Partly cloudy, with a low around 27.
Partly Cloudy
 Saturday

Saturday: Mostly sunny, with a high near 44.
Mostly Sunny
 Saturday
Night
Saturday Night: Mostly cloudy, with a low around 34.
Mostly Cloudy
Lo 28 °F⇑ Hi 44 °F Lo 28 °F Hi 53 °F Lo 47 °F⇑ Hi 54 °F⇓ Lo 27 °F Hi 44 °F Lo 34 °F

 

Overnight
 
 Mostly clear, with a temperature rising to around 34 by 5am. Southwest wind 6 to 8 mph.
Wednesday
 
 Mostly sunny, with a high near 44. Southwest wind 10 to 15 mph, with gusts as high as 28 mph.
Wednesday Night
 
 Mostly clear, with a low around 28. West wind 6 to 11 mph becoming light northwest after midnight. Winds could gust as high as 22 mph.
Thursday
 
 Mostly sunny, with a high near 53. Light south wind increasing to 5 to 10 mph in the morning.
Thursday Night
 
 Rain, mainly after 1am. Temperature rising to around 51 by 2am. South wind 8 to 17 mph, with gusts as high as 33 mph. Chance of precipitation is 90%. New precipitation amounts between a quarter and half of an inch possible.
Friday
 
 Rain, mainly before 1pm. Temperature rising to near 54 by 10am, then falling to around 43 during the remainder of the day. Breezy. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.
Friday Night
 
 Partly cloudy, with a low around 27.
Saturday
 
 Mostly sunny, with a high near 44.
Saturday Night
 
 Mostly cloudy, with a low around 34.
Sunday
 
 Partly sunny, with a high near 46.
Sunday Night
 
 Partly cloudy, with a low around 27.
Monday
 
 Mostly sunny, with a high near 38.
Monday Night
 
 Mostly cloudy, with a low around 26.
Tuesday
 
 A 30 percent chance of rain. Mostly cloudy, with a high near 43.

 

Forecast from NOAA-NWS for Islip NY.