Wilton climate

Wilton Weather in September

NOAA 1991-2020 normals for Stamford 5 N, 12 km from Wilton

Average highs run from 80°F on September 1 to 70°F on September 30, and lows from 61°F to 51°F. Normal precipitation for the month is 5.21 in over about 9 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 Wilton, 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
56°F
Precipitation
5.21 in
Record high
94°FSep 8, 2015
Record low
29°FSep 29, 2000
Chance of a freeze
0%
Days of 90°F or more
1.0
Daylight
13 h 06 min to 11 h 48 min
Cloud cover
55%
Humidity
74%
Dew point
57°F
Wind
6.3 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 180°F61°F90°F 201045°F 200927%0%
Sep 280°F61°F90°F 201040°F 201727%0%
Sep 380°F60°F89°F 201546°F 202427%0%
Sep 480°F60°F90°F 202247°F 202427%0%
Sep 579°F60°F91°F 202344°F 200027%0%
Sep 679°F60°F91°F 201840°F 200027%0%
Sep 779°F59°F93°F 202341°F 200027%0%
Sep 878°F59°F94°F 201545°F 202527%0%
Sep 978°F59°F89°F 201542°F 201327%0%
Sep 1078°F58°F86°F 201644°F 199827%0%
Sep 1178°F58°F92°F 201343°F 199828%0%
Sep 1277°F58°F89°F 200538°F 200628%0%
Sep 1377°F57°F88°F 200543°F 200228%0%
Sep 1476°F57°F86°F 201645°F 201428%0%
Sep 1576°F57°F86°F 202140°F 200129%0%
Sep 1676°F56°F85°F 201538°F 200729%0%
Sep 1775°F56°F85°F 201536°F 200729%0%
Sep 1875°F56°F84°F 202137°F 201330%0%
Sep 1975°F55°F85°F 202236°F 201930%0%
Sep 2074°F55°F82°F 200736°F 202030%0%
Sep 2174°F54°F85°F 201932°F 202031%0%
Sep 2273°F54°F86°F 201932°F 202031%0%
Sep 2373°F54°F89°F 201939°F 199831%0%
Sep 2473°F53°F90°F 201735°F 199832%0%
Sep 2572°F53°F89°F 201738°F 201632%0%
Sep 2672°F52°F90°F 200735°F 201632%0%
Sep 2772°F52°F87°F 201735°F 200033%0%
Sep 2871°F52°F85°F 202535°F 200033%0%
Sep 2971°F51°F82°F 201529°F 200033%0%
Sep 3070°F51°F81°F 202532°F 200033%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Wilton, 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 6:20 AM, sunset 7:26 PM
September 30
sunrise 6:49 AM, sunset 6:37 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00067970 (Stamford 5 N), public domain. Records: NOAA GHCN-Daily, station USW00054734, 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.