Decatur County Weather in September
Average highs run from 86°F on September 1 to 75°F on September 30, and lows from 57°F to 45°F. Normal precipitation for the month is 1.72 in over about 6 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
- 81°F
- Average low
- 51°F
- Precipitation
- 1.72 in
- Record high
- 107°FSep 2, 1939
- Record low
- 19°FSep 25, 1926
- Chance of a freeze
- 16%
- Days of 90°F or more
- 7.1
- Daylight
- 13 h 03 min to 11 h 49 min
- Cloud cover
- 44%
- Humidity
- 54%
- Dew point
- 48°F
- Wind
- 11.0 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.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 86°F | 57°F | 104°F 1948 | 37°F 1932 | 23% | 0% |
| Sep 2 | 86°F | 57°F | 107°F 1939 | 39°F 1952 | 23% | 0% |
| Sep 3 | 85°F | 57°F | 103°F 1945 | 31°F 1974 | 23% | 0% |
| Sep 4 | 85°F | 56°F | 105°F 1945 | 39°F 2008 | 22% | 0% |
| Sep 5 | 85°F | 56°F | 105°F 1931 | 39°F 2008 | 22% | 0% |
| Sep 6 | 85°F | 56°F | 104°F 1939 | 37°F 1956 | 22% | 0% |
| Sep 7 | 84°F | 55°F | 105°F 1971 | 39°F 1957 | 22% | 0% |
| Sep 8 | 84°F | 55°F | 105°F 2013 | 41°F 2012 | 22% | 0% |
| Sep 9 | 84°F | 54°F | 104°F 1964 | 35°F 1970 | 21% | 0% |
| Sep 10 | 83°F | 54°F | 102°F 1936 | 33°F 1959 | 21% | 0% |
| Sep 11 | 83°F | 54°F | 99°F 1939 | 33°F 1945 | 21% | 0% |
| Sep 12 | 83°F | 53°F | 100°F 1931 | 30°F 1949 | 21% | 0% |
| Sep 13 | 82°F | 53°F | 101°F 1955 | 29°F 1974 | 21% | 0% |
| Sep 14 | 82°F | 52°F | 101°F 2000 | 29°F 1945 | 21% | 0% |
| Sep 15 | 81°F | 52°F | 100°F 1955 | 30°F 1916 | 21% | 0% |
| Sep 16 | 81°F | 51°F | 101°F 1955 | 34°F 1951 | 21% | 0% |
| Sep 17 | 81°F | 51°F | 102°F 1947 | 29°F 1981 | 21% | 0% |
| Sep 18 | 80°F | 51°F | 100°F 1925 | 34°F 1949 | 20% | 0% |
| Sep 19 | 80°F | 50°F | 103°F 1980 | 30°F 2003 | 20% | 0% |
| Sep 20 | 79°F | 50°F | 101°F 1980 | 23°F 1983 | 20% | 0% |
| Sep 21 | 79°F | 49°F | 99°F 1986 | 28°F 1983 | 20% | 0% |
| Sep 22 | 79°F | 49°F | 97°F 1937 | 26°F 1995 | 20% | 0% |
| Sep 23 | 78°F | 48°F | 98°F 1954 | 27°F 1995 | 20% | 0% |
| Sep 24 | 78°F | 48°F | 96°F 1966 | 29°F 1944 | 20% | 0% |
| Sep 25 | 77°F | 47°F | 94°F 1938 | 19°F 1926 | 20% | 0% |
| Sep 26 | 77°F | 47°F | 100°F 1998 | 24°F 1942 | 20% | 0% |
| Sep 27 | 76°F | 46°F | 96°F 1952 | 25°F 1984 | 20% | 0% |
| Sep 28 | 76°F | 46°F | 101°F 1953 | 26°F 1984 | 20% | 0% |
| Sep 29 | 75°F | 45°F | 98°F 1969 | 22°F 1945 | 19% | 0% |
| Sep 30 | 75°F | 45°F | 96°F 1938 | 21°F 1920 | 19% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 7:10 AM, sunset 8:13 PM
- September 30
- sunrise 7:37 AM, sunset 7:26 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00145906 (Oberlin), public domain. Records: NOAA GHCN-Daily, station USC00145906, 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.