National Weather Service Forecast for: Islip NY
Issued by: National Weather Service New York, NY
Updated: 11:53 pm EDT Jun 21, 2026
 
Today

Today: A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 76. Light and variable wind becoming southeast 6 to 11 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Slight Chance
Showers then
Showers
Likely
 Tonight

Tonight: Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then showers and possibly a thunderstorm after 11pm. Low around 65. South wind 11 to 14 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Showers

 Tuesday

Tuesday: A 50 percent chance of showers, mainly before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Northwest wind 6 to 8 mph.
Chance
Showers

 Tuesday
Night
Tuesday Night: Partly cloudy, with a low around 64. Northwest wind 3 to 6 mph.
Partly Cloudy

 Wednesday

Wednesday: Sunny, with a high near 81. Northwest wind around 7 mph becoming west in the afternoon.
Sunny

 Wednesday
Night
Wednesday Night: Mostly clear, with a low around 64.
Mostly Clear

 Thursday

Thursday: Sunny, with a high near 81.
Sunny

 Thursday
Night
Thursday Night: A 30 percent chance of showers after 2am. Partly cloudy, with a low around 66.
Partly Cloudy
then Chance
Showers
 Friday

Friday: A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Chance
Showers then
Chance
T-storms
Hi 76 °F Lo 65 °F Hi 80 °F Lo 64 °F Hi 81 °F Lo 64 °F Hi 81 °F Lo 66 °F Hi 81 °F

Hazardous Weather Outlook
Rip Current Statement
 

Today
 
 A chance of showers, then showers likely and possibly a thunderstorm after 2pm. Mostly cloudy, with a high near 76. Light and variable wind becoming southeast 6 to 11 mph in the morning. Chance of precipitation is 60%. New rainfall amounts between a tenth and quarter of an inch, except higher amounts possible in thunderstorms.
Tonight
 
 Showers likely and possibly a thunderstorm before 8pm, then a chance of showers and thunderstorms between 8pm and 11pm, then showers and possibly a thunderstorm after 11pm. Low around 65. South wind 11 to 14 mph, with gusts as high as 31 mph. Chance of precipitation is 100%. New rainfall amounts between a half and three quarters of an inch possible.
Tuesday
 
 A 50 percent chance of showers, mainly before 2pm. Cloudy, then gradually becoming mostly sunny, with a high near 80. Northwest wind 6 to 8 mph.
Tuesday Night
 
 Partly cloudy, with a low around 64. Northwest wind 3 to 6 mph.
Wednesday
 
 Sunny, with a high near 81. Northwest wind around 7 mph becoming west in the afternoon.
Wednesday Night
 
 Mostly clear, with a low around 64.
Thursday
 
 Sunny, with a high near 81.
Thursday Night
 
 A 30 percent chance of showers after 2am. Partly cloudy, with a low around 66.
Friday
 
 A chance of showers, with thunderstorms also possible after 2pm. Partly sunny, with a high near 81. Chance of precipitation is 40%.
Friday Night
 
 A chance of showers and thunderstorms. Mostly cloudy, with a low around 67. Chance of precipitation is 30%.
Saturday
 
 Partly sunny, with a high near 85.
Saturday Night
 
 Partly cloudy, with a low around 67.
Sunday
 
 Mostly sunny, with a high near 85.

 

Forecast from NOAA-NWS for Islip NY.