Groton climate

Groton Weather in September

NOAA 1991-2020 normals for Freeville 1 Ne, 8.2 km from Groton

Average highs run from 75°F on September 1 to 65°F on September 30, and lows from 53°F to 44°F. Normal precipitation for the month is 4.12 in over about 11 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 Groton, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
71°F
Average low
49°F
Precipitation
4.12 in
Record high
91°FSep 7, 2023
Record low
29°FSep 19, 2020
Chance of a freeze
18%
Daylight
13 h 10 min to 11 h 46 min
Cloud cover
59%
Humidity
74%
Dew point
51°F
Wind
4.3 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 175°F53°F88°F 201236°F 201734%0%
Sep 275°F53°F82°F 201536°F 201734%0%
Sep 375°F52°F84°F 201439°F 201734%0%
Sep 474°F52°F88°F 201146°F 201635%0%
Sep 574°F52°F87°F 202345°F 202035%0%
Sep 674°F52°F90°F 201838°F 201335%0%
Sep 774°F51°F91°F 202340°F 201335%0%
Sep 873°F51°F89°F 201541°F 202535%0%
Sep 973°F51°F90°F 201538°F 201335%0%
Sep 1073°F51°F87°F 201540°F 201235%0%
Sep 1172°F50°F85°F 201336°F 201235%0%
Sep 1272°F50°F89°F 201341°F 201235%0%
Sep 1372°F50°F79°F 202340°F 201436%0%
Sep 1471°F49°F82°F 201643°F 201436%0%
Sep 1571°F49°F84°F 202435°F 202036%0%
Sep 1671°F49°F83°F 201836°F 202036%0%
Sep 1770°F48°F86°F 201830°F 201336%0%
Sep 1870°F48°F84°F 201733°F 201336%0%
Sep 1970°F48°F82°F 201529°F 202037%0%
Sep 2069°F47°F80°F 202430°F 202037%0%
Sep 2169°F47°F83°F 201632°F 202037%0%
Sep 2268°F47°F81°F 201932°F 202037%0%
Sep 2368°F46°F84°F 201935°F 201438%0%
Sep 2467°F46°F82°F 201733°F 201338%0%
Sep 2567°F46°F86°F 201732°F 201338%0%
Sep 2667°F45°F87°F 201736°F 201339%0%
Sep 2766°F45°F87°F 201740°F 201339%0%
Sep 2866°F44°F87°F 201740°F 201339%0%
Sep 2965°F44°F80°F 201938°F 201740%0%
Sep 3065°F44°F77°F 202538°F 201240%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Groton, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:30 AM, sunset 7:40 PM
September 30
sunrise 7:02 AM, sunset 6:48 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00303050 (Freeville 1 Ne), public domain. Records: NOAA GHCN-Daily, station USC00303050, 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.