Willimantic climate

Willimantic Weather in September

NOAA 1991-2020 normals for Willimantic Windham AP, 4 km from Willimantic

Average highs run from 79°F on September 1 to 69°F on September 30, and lows from 57°F to 47°F. Normal precipitation for the month is 4.11 in over about 13 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 Willimantic, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
74°F
Average low
52°F
Precipitation
4.11 in
Record high
96°FSep 8, 2015
Record low
30°FSep 22, 2020
Chance of a freeze
6%
Days of 90°F or more
0.7
Daylight
13 h 07 min to 11 h 47 min
Cloud cover
54%
Humidity
76%
Dew point
56°F
Wind
5.4 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 179°F57°F92°F 201046°F 199942%0%
Sep 279°F57°F92°F 201039°F 201742%0%
Sep 378°F57°F92°F 201546°F 202442%0%
Sep 478°F56°F90°F 201846°F 202442%0%
Sep 578°F56°F89°F 202343°F 199742%0%
Sep 678°F56°F92°F 201843°F 201342%0%
Sep 777°F56°F92°F 202344°F 200042%0%
Sep 877°F55°F96°F 201545°F 202542%0%
Sep 977°F55°F93°F 201642°F 201342%0%
Sep 1076°F55°F89°F 201641°F 200343%0%
Sep 1176°F54°F92°F 201342°F 200543%0%
Sep 1276°F54°F90°F 200538°F 200643%0%
Sep 1375°F54°F89°F 200542°F 200243%0%
Sep 1475°F53°F90°F 201645°F 201443%0%
Sep 1575°F53°F84°F 201741°F 202043%0%
Sep 1674°F52°F85°F 201539°F 201043%0%
Sep 1774°F52°F87°F 201538°F 200743%0%
Sep 1874°F52°F85°F 201537°F 201343%0%
Sep 1973°F51°F82°F 200537°F 201944%0%
Sep 2073°F51°F84°F 201634°F 202044%0%
Sep 2173°F51°F84°F 201631°F 202044%0%
Sep 2272°F50°F85°F 201630°F 202044%0%
Sep 2372°F50°F87°F 201739°F 201444%0%
Sep 2471°F49°F92°F 201735°F 199844%0%
Sep 2571°F49°F90°F 201734°F 199744%0%
Sep 2671°F49°F87°F 200737°F 201645%0%
Sep 2770°F48°F88°F 201738°F 201545%0%
Sep 2870°F48°F84°F 201437°F 200045%0%
Sep 2969°F47°F83°F 201531°F 200045%0%
Sep 3069°F47°F79°F 202533°F 200045%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Willimantic, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (EDT).

September 1
sunrise 6:15 AM, sunset 7:22 PM
September 30
sunrise 6:45 AM, sunset 6:32 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00054767 (Willimantic Windham AP), public domain. Records: NOAA GHCN-Daily, station USW00054767, 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.