Forecast

WeatherUnderground 6-day Forecast: Riverhead, NY USA

Today	Tomorrow	Friday	Saturday	Sunday	Monday

Sunny	Cloudy	Rain	Partly Cloudy	Partly Cloudy	Mostly Sunny
		0.67 in


69°F	69°F	67°F	65°F	59°F	58°F
UV: 3 Moderate	UV: 2 Low	UV: 1 Low	UV: 3 Moderate	UV: 3 Moderate	UV: 3 Moderate

Tonight	Tomorrow night	Friday night	Saturday night	Sunday night	Monday night

Partly Cloudy	Thunderstorms	Rain Early	Partly Cloudy	Mostly Clear	Mostly Clear
	0.22 in	0.47 in

	Thunder expected
57°F	59°F	51°F	44°F	41°F	39°F

Today	Areas of dense morning fog. Abundant sunshine. High 69F. Winds SSW at 5 to 10 mph.
Tonight	Some clouds. Low 57F. Winds light and variable.
Tomorrow	Cloudy. High 69F. Winds SSW at 10 to 20 mph.
Tomorrow night	Showers and thunderstorms likely. Low 59F. Winds SSW at 5 to 10 mph. Chance of rain 80%.
Friday	Rain. Potential for heavy rainfall. High 67F. Winds light and variable. Chance of rain 90%. Rainfall near a half an inch.
Friday night	Cloudy with occasional rain...mainly in the evening. Potential for heavy rainfall. Low 51F. Winds light and variable. Chance of rain 90%. Rainfall near a half an inch.
Saturday	Partly cloudy. High near 65F. Winds WNW at 5 to 10 mph.
Saturday night	Partly cloudy. Low 44F. Winds WNW at 10 to 15 mph.
Sunday	Sunshine and clouds mixed. High 59F. Winds WNW at 10 to 20 mph.
Sunday night	Mostly clear. Low 41F. Winds W at 10 to 15 mph.
Monday	Except for a few afternoon clouds, mainly sunny. High 58F. Winds WNW at 15 to 25 mph.
Monday night	A mostly clear sky. Low 39F. Winds WNW at 10 to 15 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: 3:51 pm EST Nov 03, 2026

Riverhead, NY (ERH)

	Wednesday Sunny	Thursday Mostly Cloudy then Slight Chance Rain Showers	Friday Showers And T-Storms	Saturday Rain Showers Likely	Sunday Slight Chance Rain Showers then Mostly Sunny	Monday Chance Light Rain	Tuesday Slight Chance Light Rain then Mostly Sunny
	Hi 70 °F	Hi 70 °F	Hi 67 °F	Hi 64 °F	Hi 59 °F	Hi 58 °F	Hi 59 °F

Overnight Partly Cloudy	Wednesday Night Partly Cloudy	Thursday Night Rain Showers	Friday Night Showers And T-Storms	Saturday Night Slight Chance Rain Showers	Sunday Night Partly Cloudy	Monday Night Chance Light Rain
Lo 52 °F	Lo 57 °F	Lo 59 °F	Lo 54 °F	Lo 44 °F	Lo 41 °F	Lo 40 °F

Overnight	Partly cloudy, with a low around 52. Southwest wind around 3 mph.
Wednesday	Sunny. High near 70, with temperatures falling to around 63 in the afternoon. Southwest wind 3 to 10 mph.
Wednesday Night	Partly cloudy, with a low around 57. Southwest wind around 6 mph.
Thursday	A slight chance of rain showers after 1pm. Mostly cloudy. High near 70, with temperatures falling to around 65 in the afternoon. Southwest wind 5 to 12 mph. Chance of precipitation is 20%.
Thursday Night	Rain showers. Mostly cloudy, with a low around 59. Southwest wind around 8 mph. Chance of precipitation is 80%. New rainfall amounts between a tenth and quarter of an inch possible.
Friday	Rain showers before 10am, then showers and thunderstorms. Cloudy. High near 67, with temperatures falling to around 63 in the afternoon. Chance of precipitation is 90%. New rainfall amounts between 1 and 2 inches possible.
Friday Night	Showers and thunderstorms. Cloudy, with a low around 54. Chance of precipitation is 90%.
Saturday	Rain showers likely. Partly sunny, with a high near 64. Chance of precipitation is 60%.
Saturday Night	A slight chance of rain showers. Partly cloudy, with a low around 44.
Sunday	A slight chance of rain showers before 7am. Mostly sunny, with a high near 59.
Sunday Night	Partly cloudy, with a low around 41.
Monday	A chance of rain after 7am. Mostly sunny, with a high near 58. Chance of precipitation is 30%.
Monday Night	A chance of rain. Partly cloudy, with a low around 40. Chance of precipitation is 30%.
Tuesday	A slight chance of rain before 7am. Mostly sunny, with a high near 59.

Forecast from NOAA-NWS for Riverhead, NY.

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