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National Weather Service Forecast for: Stony Brook, NY Issued by: National Weather Service New York/Upton, NY

Updated: 9:51 am EDT Mar 28, 2025

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Stony Brook, NY

This Afternoon Partly Sunny Saturday Slight Chance Rain Showers Sunday Mostly Cloudy Monday Showers And T-Storms Likely Tuesday Mostly Sunny Wednesday Mostly Sunny Thursday Chance Rain then Chance Rain Showers   Hi 62 °F Hi 75 °F Hi 55 °F Hi 62 °F Hi 53 °F Hi 47 °F Hi 58 °F     Tonight Rain Showers Likely Saturday Night Slight Chance Rain Showers Sunday Night Chance Rain Showers Monday Night Rain Showers Likely Tuesday Night Mostly Clear Wednesday Night Chance Rain Thursday Night Chance Rain Showers   Lo 47 °F Lo 42 °F Lo 46 °F Lo 41 °F Lo 32 °F Lo 37 °F Lo 45 °F

 

This Afternoon	Partly sunny. High near 62, with temperatures falling to around 59 in the afternoon. Southwest wind around 12 mph.
Tonight	Rain showers likely after 8pm. Mostly cloudy. Low around 47, with temperatures rising to around 50 overnight. South wind 6 to 9 mph. Chance of precipitation is 60%.
Saturday	A slight chance of rain showers. Mostly sunny. High near 75, with temperatures falling to around 72 in the afternoon. Southwest wind 8 to 18 mph, with gusts as high as 30 mph. Chance of precipitation is 20%.
Saturday Night	A slight chance of rain showers before 2am. Mostly cloudy. Low around 42, with temperatures rising to around 44 overnight. Northeast wind 7 to 12 mph, with gusts as high as 22 mph. Chance of precipitation is 20%.
Sunday	Mostly cloudy, with a high near 55. East wind around 12 mph.
Sunday Night	A chance of rain showers between 8pm and 2am, then a chance of rain showers and patchy fog. Cloudy. Low around 46, with temperatures rising to around 49 overnight. Chance of precipitation is 50%. New rainfall amounts less than a tenth of an inch possible.
Monday	A chance of rain showers and patchy fog before noon, then showers and thunderstorms likely. Mostly cloudy, with a high near 62. Chance of precipitation is 60%.
Monday Night	Rain showers likely. Mostly cloudy, with a low around 41. Chance of precipitation is 70%.
Tuesday	Mostly sunny, with a high near 53.
Tuesday Night	Mostly clear, with a low around 32.
Wednesday	Mostly sunny, with a high near 47.
Wednesday Night	A chance of rain after 8pm. Mostly cloudy, with a low around 37. Chance of precipitation is 50%.
Thursday	A chance of rain before noon, then a chance of rain showers. Mostly cloudy, with a high near 58. Chance of precipitation is 50%.
Thursday Night	A chance of rain showers. Mostly cloudy, with a low around 45. Chance of precipitation is 30%.

 

Forecast from NOAA-NWS for Stony Brook, NY.

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