Riverhead climate

Riverhead Weather in September

NOAA 1991-2020 normals for Riverhead Rsch Farm, 6.8 km from Riverhead

Average highs run from 80°F on September 1 to 71°F on September 30, and lows from 64°F to 55°F. Normal precipitation for the month is 4.07 in over about 8 wet days.

September day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Riverhead, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
76°F
Average low
60°F
Precipitation
4.07 in
Record high
94°FSep 1, 2010
Record low
32°FSep 22, 2020
Chance of a freeze
0%
Daylight
13 h 05 min to 11 h 48 min
Cloud cover
53%
Humidity
78%
Dew point
60°F
Wind
9.8 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Sep 180°F64°F94°F 201045°F 201724%0%
Sep 280°F64°F92°F 195339°F 201724%0%
Sep 379°F64°F86°F 201440°F 200925%0%
Sep 479°F64°F90°F 201843°F 202425%0%
Sep 579°F63°F92°F 202344°F 200025%0%
Sep 679°F63°F92°F 202342°F 200025%0%
Sep 778°F63°F91°F 202339°F 200025%0%
Sep 878°F63°F88°F 201542°F 200025%0%
Sep 978°F62°F91°F 201639°F 202425%0%
Sep 1078°F62°F86°F 196143°F 200325%0%
Sep 1177°F62°F84°F 201641°F 201225%0%
Sep 1277°F62°F88°F 195242°F 200625%0%
Sep 1377°F61°F89°F 195241°F 200625%0%
Sep 1476°F61°F82°F 202442°F 201426%0%
Sep 1576°F61°F84°F 200840°F 200126%0%
Sep 1676°F60°F91°F 199838°F 200126%0%
Sep 1775°F60°F84°F 201536°F 201326%0%
Sep 1875°F60°F82°F 196533°F 201326%0%
Sep 1975°F59°F83°F 196736°F 201326%0%
Sep 2074°F59°F81°F 202235°F 201927%0%
Sep 2174°F59°F80°F 200535°F 202027%0%
Sep 2274°F58°F84°F 196132°F 202027%0%
Sep 2373°F58°F86°F 200536°F 199827%0%
Sep 2473°F58°F85°F 201733°F 199828%0%
Sep 2573°F57°F81°F 201135°F 196328%0%
Sep 2672°F57°F80°F 196135°F 201628%0%
Sep 2772°F56°F83°F 199837°F 196628%0%
Sep 2872°F56°F80°F 201438°F 196528%0%
Sep 2971°F56°F80°F 201533°F 200028%0%
Sep 3071°F55°F79°F 195233°F 200028%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Riverhead, in percent, and of at least 0.1 inch of snowfall.01020301102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:18 AM, sunset 7:23 PM
September 30
sunrise 6:46 AM, sunset 6:34 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00307134 (Riverhead Rsch Farm), public domain. Records: NOAA GHCN-Daily, station USW00014719, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.