Harper Weather in September
Average highs run from 90°F on September 1 to 84°F on September 30, and lows from 66°F to 59°F. Normal precipitation for the month is 3.18 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
- 87°F
- Average low
- 62°F
- Precipitation
- 3.18 in
- Record high
- 109°FSep 5, 2000
- Record low
- 35°FSep 27, 1942
- Chance of a freeze
- 0%
- Days of 90°F or more
- 11.2
- Daylight
- 12 h 46 min to 11 h 53 min
- Cloud cover
- 45%
- Humidity
- 64%
- Dew point
- 62°F
- Wind
- 8.5 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 | 90°F | 66°F | 106°F 1951 | 57°F 1944 | 20% | 0% |
| Sep 2 | 90°F | 65°F | 104°F 1951 | 57°F 1987 | 20% | 0% |
| Sep 3 | 90°F | 65°F | 105°F 2000 | 55°F 1974 | 20% | 0% |
| Sep 4 | 89°F | 65°F | 107°F 2000 | 54°F 1974 | 20% | 0% |
| Sep 5 | 89°F | 65°F | 109°F 2000 | 50°F 1952 | 20% | 0% |
| Sep 6 | 89°F | 65°F | 104°F 2000 | 47°F 2011 | 20% | 0% |
| Sep 7 | 89°F | 64°F | 101°F 1963 | 48°F 2011 | 20% | 0% |
| Sep 8 | 88°F | 64°F | 100°F 2012 | 49°F 2011 | 20% | 0% |
| Sep 9 | 88°F | 64°F | 104°F 2023 | 51°F 2017 | 20% | 0% |
| Sep 10 | 88°F | 64°F | 105°F 2023 | 50°F 2024 | 20% | 0% |
| Sep 11 | 88°F | 63°F | 102°F 2023 | 50°F 1968 | 20% | 0% |
| Sep 12 | 87°F | 63°F | 101°F 2000 | 49°F 1960 | 20% | 0% |
| Sep 13 | 87°F | 63°F | 100°F 2011 | 51°F 2017 | 20% | 0% |
| Sep 14 | 87°F | 63°F | 100°F 2011 | 47°F 1902 | 20% | 0% |
| Sep 15 | 87°F | 63°F | 99°F 2011 | 50°F 1989 | 20% | 0% |
| Sep 16 | 87°F | 62°F | 98°F 1962 | 51°F 1989 | 20% | 0% |
| Sep 17 | 86°F | 62°F | 97°F 1997 | 49°F 1903 | 20% | 0% |
| Sep 18 | 86°F | 62°F | 96°F 1997 | 43°F 1903 | 20% | 0% |
| Sep 19 | 86°F | 62°F | 98°F 1956 | 39°F 1981 | 20% | 0% |
| Sep 20 | 86°F | 61°F | 100°F 1953 | 46°F 1981 | 20% | 0% |
| Sep 21 | 86°F | 61°F | 97°F 2005 | 45°F 1913 | 20% | 0% |
| Sep 22 | 85°F | 61°F | 98°F 2005 | 37°F 1983 | 20% | 0% |
| Sep 23 | 85°F | 61°F | 97°F 2023 | 41°F 1999 | 19% | 0% |
| Sep 24 | 85°F | 60°F | 97°F 2005 | 44°F 1947 | 19% | 0% |
| Sep 25 | 85°F | 60°F | 105°F 2005 | 41°F 1989 | 19% | 0% |
| Sep 26 | 85°F | 60°F | 105°F 2005 | 42°F 1975 | 19% | 0% |
| Sep 27 | 84°F | 60°F | 108°F 1953 | 35°F 1942 | 19% | 0% |
| Sep 28 | 84°F | 59°F | 103°F 1953 | 39°F 1942 | 19% | 0% |
| Sep 29 | 84°F | 59°F | 100°F 1979 | 41°F 1908 | 19% | 0% |
| Sep 30 | 84°F | 59°F | 97°F 2011 | 38°F 2000 | 18% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 7:14 AM, sunset 8:00 PM
- September 30
- sunrise 7:30 AM, sunset 7:23 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00413954 (Harper 3ENE), public domain. Records: NOAA GHCN-Daily, station USC00413329, 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.