Franklin County climate

Franklin County Weather in September

NOAA 1991-2020 normals for Mt Vernon, 2.3 km from Franklin County

Average highs run from 92°F on September 1 to 84°F on September 30, and lows from 69°F to 60°F. Normal precipitation for the month is 3.58 in over about 6 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 Franklin County, in °F, with the record for each date.20406080100120151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

September at a glance

Average high
88°F
Average low
65°F
Precipitation
3.58 in
Record high
109°FSep 1, 2000
Record low
36°FSep 22, 1983
Chance of a freeze
0%
Days of 90°F or more
13.1
Daylight
12 h 51 min to 11 h 52 min
Cloud cover
44%
Humidity
64%
Dew point
62°F
Wind
6.9 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 192°F69°F109°F 200052°F 198721%0%
Sep 292°F69°F109°F 193952°F 196721%0%
Sep 392°F69°F106°F 200051°F 195221%0%
Sep 491°F68°F109°F 200049°F 197421%0%
Sep 591°F68°F108°F 199849°F 197421%0%
Sep 691°F68°F107°F 192548°F 201121%0%
Sep 791°F68°F106°F 202647°F 201121%0%
Sep 890°F67°F107°F 202347°F 201121%0%
Sep 990°F67°F107°F 202650°F 201121%0%
Sep 1090°F67°F105°F 202649°F 201121%0%
Sep 1190°F66°F104°F 202649°F 197621%0%
Sep 1289°F66°F103°F 193045°F 194021%0%
Sep 1389°F66°F107°F 201144°F 194021%0%
Sep 1489°F65°F105°F 202645°F 194021%0%
Sep 1589°F65°F105°F 202646°F 194521%0%
Sep 1688°F65°F105°F 202644°F 197921%0%
Sep 1788°F64°F101°F 202545°F 197921%0%
Sep 1888°F64°F100°F 202541°F 198121%0%
Sep 1987°F64°F104°F 193739°F 198121%0%
Sep 2087°F63°F103°F 193739°F 198121%0%
Sep 2187°F63°F107°F 193741°F 198321%0%
Sep 2286°F63°F106°F 193736°F 198320%0%
Sep 2386°F62°F104°F 202236°F 198320%0%
Sep 2486°F62°F100°F 193138°F 198920%0%
Sep 2585°F62°F102°F 202239°F 198920%0%
Sep 2685°F61°F102°F 200540°F 199420%0%
Sep 2785°F61°F103°F 200537°F 194220%0%
Sep 2884°F60°F101°F 193838°F 198520%0%
Sep 2984°F60°F101°F 202338°F 196720%0%
Sep 3084°F60°F100°F 193838°F 196720%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Franklin County, 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 6:55 AM, sunset 7:46 PM
September 30
sunrise 7:15 AM, sunset 7:07 PM

Every day of September: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00416119 (Mt Vernon), public domain. Records: NOAA GHCN-Daily, station USC00416108, 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.