National Weather Service Forecast for: Islip NY
Issued by: National Weather Service New York, NY
Updated: 7:10 am EDT Jul 5, 2025
 
Today

Today: Mostly sunny, with a high near 82. Calm wind becoming south 5 to 9 mph in the morning.
Mostly Sunny

 Tonight

Tonight: Partly cloudy, with a low around 70. Southwest wind around 10 mph.
Partly Cloudy

 Sunday

Sunday: Sunny, with a high near 84. South wind 9 to 14 mph.
Sunny

 Sunday
Night
Sunday Night: Patchy fog after 2am. Otherwise, increasing clouds, with a low around 72. Southwest wind 8 to 13 mph.
Partly Cloudy
then Patchy
Fog
 Monday

Monday: A 20 percent chance of showers and thunderstorms after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 84. South wind 7 to 13 mph.
Patchy Fog
then Slight
Chance
T-storms
 Monday
Night
Monday Night: A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 72.
Chance
Showers

 Tuesday

Tuesday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 50%.
Chance
Showers then
Chance
T-storms
 Tuesday
Night
Tuesday Night: A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Chance
T-storms then
Chance
Showers
 Wednesday

Wednesday: Mostly sunny, with a high near 84.
Mostly Sunny
Hi 82 °F Lo 70 °F Hi 84 °F Lo 72 °F Hi 84 °F Lo 72 °F Hi 84 °F Lo 70 °F Hi 84 °F

 

Today
 
 Mostly sunny, with a high near 82. Calm wind becoming south 5 to 9 mph in the morning.
Tonight
 
 Partly cloudy, with a low around 70. Southwest wind around 10 mph.
Sunday
 
 Sunny, with a high near 84. South wind 9 to 14 mph.
Sunday Night
 
 Patchy fog after 2am. Otherwise, increasing clouds, with a low around 72. Southwest wind 8 to 13 mph.
Monday
 
 A 20 percent chance of showers and thunderstorms after 2pm. Patchy fog before 8am. Otherwise, partly sunny, with a high near 84. South wind 7 to 13 mph.
Monday Night
 
 A 40 percent chance of showers after 8pm. Mostly cloudy, with a low around 72.
Tuesday
 
 A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 84. Chance of precipitation is 50%.
Tuesday Night
 
 A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 2am. Mostly cloudy, with a low around 70. Chance of precipitation is 30%.
Wednesday
 
 Mostly sunny, with a high near 84.
Wednesday Night
 
 Partly cloudy, with a low around 70.
Thursday
 
 Partly sunny, with a high near 83.
Thursday Night
 
 A 30 percent chance of showers. Cloudy, with a low around 69.
Friday
 
 A 30 percent chance of showers. Mostly cloudy, with a high near 80.

 

Forecast from NOAA-NWS for Islip NY.