Forecast

WeatherUnderground 5-day Forecast: Riverhead, NY USA

Tonight	Clear skies. Low around 15F. Winds N at 5 to 10 mph.
Tomorrow	Sunshine and clouds mixed. High 29F. Winds N at 5 to 10 mph.
Tomorrow night	Partly cloudy. Low near 20F. Winds light and variable.
Tuesday	Rain showers in the morning will evolve into a more steady rain in the afternoon. High 38F. Winds ESE at 5 to 10 mph. Chance of rain 80%.
Tuesday night	Periods of rain. Low 34F. Winds light and variable. Chance of rain 90%. Rainfall near a quarter of an inch.
Wednesday	Cloudy skies early will become partly cloudy later in the day. Slight chance of a rain shower. High around 45F. Winds light and variable.
Wednesday night	Cloudy with showers. Low around 35F. Winds light and variable. Chance of rain 50%.
Thursday	Cloudy with occasional rain showers. High 44F. Winds light and variable. Chance of rain 60%.
Thursday night	Periods of rain. Low near 35F. Winds E at 5 to 10 mph. Chance of rain 80%. Rainfall near a quarter of an inch.
Friday	Rain showers early with overcast skies later in the day. High near 40F. Winds NE at 10 to 15 mph. Chance of rain 50%.
Friday night	Cloudy. Low 33F. Winds ENE at 5 to 10 mph.

WeatherUnderground forecast for Riverhead, NY USA.
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National Weather Service Forecast for: Riverhead, NY
Issued by: National Weather Service New York/Upton, NY

Updated: 3:08 pm EST Mar 01, 2026

Riverhead, NY (ERH)

This Afternoon Sunny	Monday Mostly Sunny	Tuesday Rain And Snow	Wednesday Light Rain	Thursday Chance Light Rain	Friday Chance Light Rain	Saturday Slight Chance Light Rain
Hi 35 °F	Hi 28 °F	Hi 40 °F	Hi 44 °F	Hi 49 °F	Hi 43 °F	Hi 49 °F

Tonight Mostly Clear	Monday Night Mostly Clear	Tuesday Night Light Rain	Wednesday Night Chance Light Rain	Thursday Night Chance Light Rain	Friday Night Chance Light Rain	Saturday Night Chance Light Rain
Lo 14 °F	Lo 16 °F	Lo 33 °F	Lo 35 °F	Lo 35 °F	Lo 33 °F	Lo 38 °F

This Afternoon	Sunny, with a high near 35. North wind around 9 mph.
Tonight	Mostly clear, with a low around 14. Wind chill values as low as 4. North wind around 10 mph.
Monday	Mostly sunny, with a high near 28. Wind chill values as low as 3. Northwest wind 2 to 8 mph.
Monday Night	Mostly clear. Low around 16, with temperatures rising to around 23 overnight. Wind chill values as low as 16. South wind around 3 mph.
Tuesday	Rain and snow after 7am. Mostly cloudy, with a high near 40. Southeast wind around 6 mph. Chance of precipitation is 90%. New snow accumulation of less than half an inch possible.
Tuesday Night	Rain. Cloudy, with a low around 33. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Wednesday	Rain. Partly sunny, with a high near 44. Chance of precipitation is 80%.
Wednesday Night	A chance of rain. Cloudy, with a low around 35. Chance of precipitation is 40%.
Thursday	A chance of rain. Cloudy, with a high near 49. Chance of precipitation is 40%.
Thursday Night	A chance of rain. Cloudy, with a low around 35. Chance of precipitation is 50%.
Friday	A chance of rain. Cloudy, with a high near 43. Chance of precipitation is 50%.
Friday Night	A chance of rain. Cloudy, with a low around 33. Chance of precipitation is 30%.
Saturday	A slight chance of rain. Cloudy, with a high near 49.
Saturday Night	A chance of rain. Mostly cloudy, with a low around 38.

Forecast from NOAA-NWS for Riverhead, NY.

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