National Weather Service Forecast for: Islip NY
Issued by: National Weather Service New York, NY
Updated: 5:52 am EST Dec 22, 2025
 
Today

Today: Sunny, with a high near 38. Wind chill values between 20 and 30. West wind 8 to 10 mph.
Sunny

 Tonight

Tonight: Snow likely, mainly after 4am. Increasing clouds, with a low around 31. West wind around 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Mostly Cloudy
then Snow
Likely
 Tuesday

Tuesday: Rain and snow, becoming all rain after 10am. High near 42. Southwest wind 6 to 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Rain/Snow
then Rain
 Tuesday
Night
Tuesday Night: Mostly cloudy, with a low around 34. West wind 6 to 10 mph, with gusts as high as 22 mph.
Mostly Cloudy

 Wednesday

Wednesday: Sunny, with a high near 43. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Sunny

 Wednesday
Night
Wednesday Night: Increasing clouds, with a low around 29.
Increasing
Clouds
 Christmas
Day
Christmas Day: Mostly cloudy, with a high near 43.
Mostly Cloudy

 Thursday
Night
Thursday Night: A 30 percent chance of rain after 1am. Cloudy, with a low around 35.
Cloudy then
Chance Rain
 Friday

Friday: Rain likely. Cloudy, with a high near 51. Chance of precipitation is 70%.
Rain Likely
Hi 38 °F Lo 31 °F Hi 42 °F Lo 34 °F Hi 43 °F Lo 29 °F Hi 43 °F Lo 35 °F Hi 51 °F

 

Today
 
 Sunny, with a high near 38. Wind chill values between 20 and 30. West wind 8 to 10 mph.
Tonight
 
 Snow likely, mainly after 4am. Increasing clouds, with a low around 31. West wind around 7 mph. Chance of precipitation is 60%. New snow accumulation of less than a half inch possible.
Tuesday
 
 Rain and snow, becoming all rain after 10am. High near 42. Southwest wind 6 to 10 mph. Chance of precipitation is 80%. New snow accumulation of less than a half inch possible.
Tuesday Night
 
 Mostly cloudy, with a low around 34. West wind 6 to 10 mph, with gusts as high as 22 mph.
Wednesday
 
 Sunny, with a high near 43. Northwest wind 9 to 14 mph, with gusts as high as 24 mph.
Wednesday Night
 
 Increasing clouds, with a low around 29.
Christmas Day
 
 Mostly cloudy, with a high near 43.
Thursday Night
 
 A 30 percent chance of rain after 1am. Cloudy, with a low around 35.
Friday
 
 Rain likely. Cloudy, with a high near 51. Chance of precipitation is 70%.
Friday Night
 
 A 50 percent chance of rain before 1am. Mostly cloudy, with a low around 33.
Saturday
 
 Mostly cloudy, with a high near 43.
Saturday Night
 
 A 30 percent chance of rain. Mostly cloudy, with a low around 34.
Sunday
 
 A 50 percent chance of rain. Mostly cloudy, with a high near 48.

 

Forecast from NOAA-NWS for Islip NY.