Jefferson County Weather in September
Average highs run from 88°F on September 1 to 81°F on September 30, and lows from 68°F to 59°F. Normal precipitation for the month is 4.03 in over about 8 wet days.
September day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
September at a glance
- Average high
- 85°F
- Average low
- 64°F
- Precipitation
- 4.03 in
- Record high
- 110°FSep 25, 1921
- Record low
- 34°FSep 30, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 9.9
- Daylight
- 12 h 51 min to 11 h 52 min
- Cloud cover
- 49%
- Humidity
- 72%
- Dew point
- 64°F
- Wind
- 6.5 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.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 88°F | 68°F | 102°F 1912 | 55°F 1976 | 28% | 0% |
| Sep 2 | 88°F | 68°F | 100°F 1912 | 54°F 1954 | 28% | 0% |
| Sep 3 | 87°F | 67°F | 100°F 1912 | 52°F 1909 | 28% | 0% |
| Sep 4 | 87°F | 67°F | 104°F 1951 | 48°F 1997 | 27% | 0% |
| Sep 5 | 87°F | 67°F | 101°F 1944 | 49°F 1997 | 27% | 0% |
| Sep 6 | 87°F | 67°F | 100°F 1944 | 53°F 1982 | 27% | 0% |
| Sep 7 | 87°F | 67°F | 99°F 1914 | 52°F 1984 | 27% | 0% |
| Sep 8 | 87°F | 66°F | 100°F 1954 | 52°F 1982 | 26% | 0% |
| Sep 9 | 86°F | 66°F | 100°F 1954 | 50°F 1998 | 26% | 0% |
| Sep 10 | 86°F | 66°F | 99°F 1915 | 48°F 1956 | 26% | 0% |
| Sep 11 | 86°F | 66°F | 100°F 1915 | 46°F 1956 | 25% | 0% |
| Sep 12 | 86°F | 65°F | 100°F 1915 | 45°F 1917 | 25% | 0% |
| Sep 13 | 86°F | 65°F | 97°F 1962 | 45°F 1976 | 25% | 0% |
| Sep 14 | 85°F | 65°F | 96°F 1956 | 49°F 1969 | 25% | 0% |
| Sep 15 | 85°F | 64°F | 97°F 1956 | 44°F 1985 | 25% | 0% |
| Sep 16 | 85°F | 64°F | 101°F 1980 | 46°F 1985 | 24% | 0% |
| Sep 17 | 85°F | 64°F | 103°F 1980 | 47°F 1968 | 24% | 0% |
| Sep 18 | 85°F | 63°F | 101°F 2019 | 46°F 1910 | 24% | 0% |
| Sep 19 | 84°F | 63°F | 99°F 1921 | 44°F 1981 | 24% | 0% |
| Sep 20 | 84°F | 63°F | 98°F 1921 | 42°F 1981 | 24% | 0% |
| Sep 21 | 84°F | 62°F | 95°F 1911 | 43°F 1984 | 24% | 0% |
| Sep 22 | 84°F | 62°F | 99°F 1940 | 44°F 1918 | 24% | 0% |
| Sep 23 | 83°F | 62°F | 96°F 1940 | 42°F 1918 | 24% | 0% |
| Sep 24 | 83°F | 61°F | 97°F 1961 | 46°F 1976 | 24% | 0% |
| Sep 25 | 83°F | 61°F | 110°F 1921 | 43°F 1967 | 24% | 0% |
| Sep 26 | 83°F | 61°F | 98°F 2019 | 43°F 1981 | 24% | 0% |
| Sep 27 | 82°F | 60°F | 100°F 2019 | 44°F 1981 | 24% | 0% |
| Sep 28 | 82°F | 60°F | 100°F 2019 | 42°F 1985 | 24% | 0% |
| Sep 29 | 82°F | 59°F | 96°F 2019 | 41°F 1962 | 23% | 0% |
| Sep 30 | 81°F | 59°F | 96°F 1904 | 34°F 1967 | 23% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:04 AM, sunset 7:55 PM
- September 30
- sunrise 7:23 AM, sunset 7:15 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00095314 (Louisville 1 E), public domain. Records: NOAA GHCN-Daily, station USC00099194, 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.