Riley County Weather in September
Average highs run from 85°F on September 1 to 75°F on September 30, and lows from 61°F to 49°F. Normal precipitation for the month is 2.83 in over about 7 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
- 55°F
- Precipitation
- 2.83 in
- Record high
- 111°FSep 2, 2000
- Record low
- 31°FSep 21, 1999
- Chance of a freeze
- 5%
- Days of 90°F or more
- 5.4
- Daylight
- 13 h 01 min to 11 h 49 min
- Cloud cover
- 45%
- Humidity
- 66%
- Dew point
- 55°F
- Wind
- 10.1 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 | 85°F | 61°F | 109°F 2011 | 52°F 2009 | 25% | 0% |
| Sep 2 | 85°F | 60°F | 111°F 2000 | 53°F 2003 | 25% | 0% |
| Sep 3 | 85°F | 60°F | 105°F 2000 | 49°F 2006 | 25% | 0% |
| Sep 4 | 84°F | 60°F | 101°F 2023 | 47°F 2010 | 25% | 0% |
| Sep 5 | 84°F | 59°F | 101°F 2026 | 45°F 2008 | 25% | 0% |
| Sep 6 | 84°F | 59°F | 101°F 1998 | 42°F 2011 | 25% | 0% |
| Sep 7 | 83°F | 59°F | 103°F 2013 | 43°F 2011 | 25% | 0% |
| Sep 8 | 83°F | 58°F | 105°F 2026 | 44°F 2011 | 25% | 0% |
| Sep 9 | 83°F | 58°F | 98°F 2013 | 44°F 1999 | 25% | 0% |
| Sep 10 | 83°F | 58°F | 102°F 2000 | 41°F 1962 | 25% | 0% |
| Sep 11 | 82°F | 57°F | 96°F 1963 | 45°F 2007 | 25% | 0% |
| Sep 12 | 82°F | 57°F | 96°F 2011 | 39°F 2014 | 25% | 0% |
| Sep 13 | 82°F | 56°F | 100°F 2000 | 35°F 2014 | 25% | 0% |
| Sep 14 | 81°F | 56°F | 98°F 2026 | 40°F 1961 | 25% | 0% |
| Sep 15 | 81°F | 56°F | 96°F 2019 | 36°F 1961 | 25% | 0% |
| Sep 16 | 81°F | 55°F | 94°F 2006 | 39°F 1999 | 25% | 0% |
| Sep 17 | 80°F | 55°F | 97°F 2000 | 46°F 2023 | 25% | 0% |
| Sep 18 | 80°F | 54°F | 100°F 2022 | 41°F 2003 | 25% | 0% |
| Sep 19 | 80°F | 54°F | 101°F 2022 | 36°F 2003 | 25% | 0% |
| Sep 20 | 79°F | 54°F | 101°F 2022 | 37°F 1999 | 25% | 0% |
| Sep 21 | 79°F | 53°F | 97°F 2017 | 31°F 1999 | 25% | 0% |
| Sep 22 | 78°F | 53°F | 97°F 2017 | 35°F 1999 | 25% | 0% |
| Sep 23 | 78°F | 52°F | 94°F 2017 | 37°F 2012 | 25% | 0% |
| Sep 24 | 78°F | 52°F | 93°F 2017 | 41°F 2001 | 25% | 0% |
| Sep 25 | 77°F | 51°F | 93°F 1998 | 37°F 2001 | 25% | 0% |
| Sep 26 | 77°F | 51°F | 98°F 2021 | 35°F 2000 | 25% | 0% |
| Sep 27 | 76°F | 50°F | 96°F 2021 | 36°F 1964 | 24% | 0% |
| Sep 28 | 76°F | 50°F | 98°F 2023 | 34°F 1964 | 24% | 0% |
| Sep 29 | 76°F | 49°F | 97°F 2023 | 35°F 2009 | 24% | 0% |
| Sep 30 | 75°F | 49°F | 96°F 2023 | 35°F 2003 | 24% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (CDT).
- September 1
- sunrise 6:56 AM, sunset 7:57 PM
- September 30
- sunrise 7:22 AM, sunset 7:11 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00148259 (Tuttle Creek Lake), public domain. Records: NOAA GHCN-Daily, station USW00003936, 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.