Dayton Weather in September
Average highs run from 86°F on September 1 to 77°F on September 30, and lows from 64°F to 54°F. Normal precipitation for the month is 4.82 in over about 9 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
- 82°F
- Average low
- 60°F
- Precipitation
- 4.82 in
- Record high
- 100°FSep 1, 1957
- Record low
- 30°FSep 30, 1967
- Chance of a freeze
- 0%
- Days of 90°F or more
- 4.0
- Daylight
- 12 h 55 min to 11 h 51 min
- Cloud cover
- 50%
- Humidity
- 69%
- Dew point
- 59°F
- Wind
- 3.6 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 | 64°F | 100°F 1957 | 54°F 1984 | 31% | 0% |
| Sep 2 | 86°F | 64°F | 96°F 1957 | 50°F 1987 | 31% | 0% |
| Sep 3 | 86°F | 64°F | 99°F 2011 | 49°F 2017 | 31% | 0% |
| Sep 4 | 85°F | 63°F | 98°F 2026 | 51°F 2017 | 31% | 0% |
| Sep 5 | 85°F | 63°F | 97°F 2026 | 51°F 1967 | 30% | 0% |
| Sep 6 | 85°F | 63°F | 97°F 1980 | 50°F 1984 | 30% | 0% |
| Sep 7 | 85°F | 63°F | 96°F 1980 | 49°F 1984 | 30% | 0% |
| Sep 8 | 85°F | 62°F | 97°F 1999 | 47°F 2017 | 30% | 0% |
| Sep 9 | 84°F | 62°F | 96°F 1999 | 49°F 1958 | 30% | 0% |
| Sep 10 | 84°F | 62°F | 94°F 2016 | 49°F 1958 | 29% | 0% |
| Sep 11 | 84°F | 61°F | 96°F 2002 | 42°F 1976 | 29% | 0% |
| Sep 12 | 83°F | 61°F | 93°F 1962 | 44°F 1976 | 29% | 0% |
| Sep 13 | 83°F | 61°F | 95°F 2019 | 46°F 1968 | 29% | 0% |
| Sep 14 | 83°F | 60°F | 98°F 2019 | 45°F 1975 | 29% | 0% |
| Sep 15 | 83°F | 60°F | 94°F 1956 | 43°F 1964 | 29% | 0% |
| Sep 16 | 82°F | 60°F | 95°F 1980 | 47°F 1985 | 29% | 0% |
| Sep 17 | 82°F | 59°F | 95°F 1991 | 47°F 1984 | 29% | 0% |
| Sep 18 | 82°F | 59°F | 95°F 2019 | 43°F 1981 | 29% | 0% |
| Sep 19 | 81°F | 59°F | 96°F 2019 | 42°F 1973 | 29% | 0% |
| Sep 20 | 81°F | 58°F | 92°F 1978 | 42°F 1981 | 29% | 0% |
| Sep 21 | 81°F | 58°F | 92°F 2024 | 45°F 1981 | 29% | 0% |
| Sep 22 | 80°F | 58°F | 96°F 1980 | 36°F 1983 | 29% | 0% |
| Sep 23 | 80°F | 57°F | 92°F 1980 | 38°F 1983 | 29% | 0% |
| Sep 24 | 80°F | 57°F | 92°F 2010 | 37°F 1963 | 29% | 0% |
| Sep 25 | 79°F | 56°F | 93°F 2010 | 37°F 1963 | 28% | 0% |
| Sep 26 | 79°F | 56°F | 92°F 2019 | 36°F 2012 | 28% | 0% |
| Sep 27 | 78°F | 56°F | 90°F 1986 | 42°F 2000 | 28% | 0% |
| Sep 28 | 78°F | 55°F | 92°F 2019 | 40°F 1985 | 28% | 0% |
| Sep 29 | 78°F | 55°F | 90°F 2019 | 38°F 1962 | 28% | 0% |
| Sep 30 | 77°F | 54°F | 94°F 2019 | 30°F 1967 | 28% | 0% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (EDT).
- September 1
- sunrise 7:12 AM, sunset 8:07 PM
- September 30
- sunrise 7:34 AM, sunset 7:25 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00402360 (Dayton 2SE), public domain. Records: NOAA GHCN-Daily, station USC00402360, 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.