Clark County Weather in September
Average highs run from 83°F on September 1 to 73°F on September 30, and lows from 59°F to 49°F. Normal precipitation for the month is 3.92 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
- 79°F
- Average low
- 54°F
- Precipitation
- 3.92 in
- Record high
- 102°FSep 2, 2011
- Record low
- 30°FSep 23, 1992
- Chance of a freeze
- 3%
- Days of 90°F or more
- 3.9
- Daylight
- 13 h 05 min to 11 h 48 min
- Cloud cover
- 46%
- Humidity
- 69%
- Dew point
- 55°F
- Wind
- 8.9 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.
| Date | Normal high | Normal low | Record high | Record low | Chance wet | Chance of snow |
|---|---|---|---|---|---|---|
| Sep 1 | 83°F | 59°F | 99°F 1953 | 48°F 1967 | 25% | 0% |
| Sep 2 | 83°F | 59°F | 102°F 2011 | 52°F 1967 | 25% | 0% |
| Sep 3 | 82°F | 59°F | 101°F 2011 | 45°F 1974 | 25% | 0% |
| Sep 4 | 82°F | 58°F | 96°F 1960 | 43°F 1974 | 25% | 0% |
| Sep 5 | 82°F | 58°F | 98°F 1990 | 45°F 1988 | 25% | 0% |
| Sep 6 | 82°F | 58°F | 98°F 1936 | 46°F 1962 | 25% | 0% |
| Sep 7 | 82°F | 57°F | 100°F 1990 | 45°F 1956 | 25% | 0% |
| Sep 8 | 81°F | 57°F | 96°F 2013 | 43°F 1986 | 25% | 0% |
| Sep 9 | 81°F | 57°F | 97°F 1933 | 47°F 2008 | 25% | 0% |
| Sep 10 | 81°F | 56°F | 102°F 2013 | 44°F 1976 | 25% | 0% |
| Sep 11 | 80°F | 56°F | 100°F 1936 | 42°F 1940 | 25% | 0% |
| Sep 12 | 80°F | 56°F | 97°F 2013 | 44°F 1940 | 25% | 0% |
| Sep 13 | 80°F | 55°F | 96°F 1939 | 40°F 2014 | 25% | 0% |
| Sep 14 | 79°F | 55°F | 98°F 1939 | 41°F 1974 | 25% | 0% |
| Sep 15 | 79°F | 55°F | 100°F 1939 | 41°F 1961 | 24% | 0% |
| Sep 16 | 79°F | 54°F | 92°F 1956 | 41°F 1937 | 24% | 0% |
| Sep 17 | 78°F | 54°F | 95°F 1997 | 43°F 2011 | 24% | 0% |
| Sep 18 | 78°F | 53°F | 94°F 1953 | 40°F 1981 | 25% | 0% |
| Sep 19 | 78°F | 53°F | 92°F 1940 | 37°F 1991 | 25% | 0% |
| Sep 20 | 77°F | 53°F | 93°F 1940 | 38°F 1991 | 25% | 0% |
| Sep 21 | 77°F | 52°F | 94°F 2022 | 37°F 1983 | 25% | 0% |
| Sep 22 | 77°F | 52°F | 93°F 1937 | 36°F 1995 | 24% | 0% |
| Sep 23 | 76°F | 52°F | 92°F 1988 | 30°F 1992 | 24% | 0% |
| Sep 24 | 76°F | 51°F | 93°F 2017 | 32°F 1992 | 24% | 0% |
| Sep 25 | 75°F | 51°F | 91°F 2017 | 37°F 1989 | 24% | 0% |
| Sep 26 | 75°F | 51°F | 91°F 1953 | 33°F 1991 | 24% | 0% |
| Sep 27 | 75°F | 50°F | 89°F 1971 | 38°F 1934 | 24% | 0% |
| Sep 28 | 74°F | 50°F | 97°F 1953 | 35°F 1951 | 24% | 0% |
| Sep 29 | 74°F | 50°F | 98°F 1953 | 32°F 1984 | 24% | 0% |
| Sep 30 | 73°F | 49°F | 90°F 1933 | 35°F 1984 | 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 6:34 AM, sunset 7:39 PM
- September 30
- sunrise 7:03 AM, sunset 6:51 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00132299 (Donnellson), public domain. Records: NOAA GHCN-Daily, station USC00134381, 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.