Seymour climate

Seymour Weather in September

NOAA 1991-2020 normals for Mansfield, 17.4 km from Seymour

Average highs run from 85°F on September 1 to 75°F on September 30, and lows from 62°F to 52°F. Normal precipitation for the month is 4.07 in over about 7 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 Seymour, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
80°F
Average low
57°F
Precipitation
4.07 in
Record high
104°FSep 4, 1947
Record low
30°FSep 27, 1942
Chance of a freeze
2%
Days of 90°F or more
2.8
Daylight
12 h 58 min to 11 h 50 min
Cloud cover
46%
Humidity
69%
Dew point
57°F
Wind
6.0 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 185°F62°F102°F 200043°F 196723%0%
Sep 284°F62°F101°F 200049°F 195223%0%
Sep 384°F62°F102°F 200041°F 197423%0%
Sep 484°F61°F104°F 194739°F 197423%0%
Sep 583°F61°F101°F 202647°F 197423%0%
Sep 683°F61°F101°F 202645°F 197423%0%
Sep 783°F60°F104°F 194744°F 201123%0%
Sep 882°F60°F100°F 202645°F 195623%0%
Sep 982°F59°F101°F 202642°F 194323%0%
Sep 1082°F59°F96°F 198438°F 197623%0%
Sep 1181°F59°F96°F 200037°F 194023%0%
Sep 1281°F58°F96°F 198036°F 194023%0%
Sep 1381°F58°F99°F 201141°F 196023%0%
Sep 1480°F58°F98°F 197143°F 197423%0%
Sep 1580°F57°F100°F 202638°F 196123%0%
Sep 1680°F57°F98°F 202641°F 196124%0%
Sep 1779°F57°F98°F 202640°F 198124%0%
Sep 1879°F56°F95°F 201937°F 197324%0%
Sep 1979°F56°F96°F 195437°F 199124%0%
Sep 2078°F55°F97°F 195437°F 199124%0%
Sep 2178°F55°F95°F 202237°F 198324%0%
Sep 2278°F55°F92°F 195633°F 199524%0%
Sep 2377°F54°F92°F 196035°F 198324%0%
Sep 2477°F54°F91°F 201632°F 198925%0%
Sep 2577°F54°F90°F 198136°F 198925%0%
Sep 2676°F53°F92°F 195334°F 197525%0%
Sep 2776°F53°F91°F 195330°F 194225%0%
Sep 2875°F52°F101°F 195335°F 196725%0%
Sep 2975°F52°F98°F 195333°F 196725%0%
Sep 3075°F52°F91°F 197931°F 198425%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Seymour, in percent, and of at least 0.1 inch of snowfall.05101520251102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

September 1
sunrise 6:42 AM, sunset 7:40 PM
September 30
sunrise 7:06 AM, sunset 6:56 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00235227 (Mansfield), public domain. Records: NOAA GHCN-Daily, station USW00013995, 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.