Dayton Weather in September
Average highs run from 79°F on September 1 to 68°F on September 30, and lows from 57°F to 48°F. Normal precipitation for the month is 0.29 in over about 1 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
- 74°F
- Average low
- 53°F
- Precipitation
- 0.29 in
- Record high
- 103°FSep 3, 1950
- Record low
- 17°FSep 22, 1895
- Chance of a freeze
- 8%
- Daylight
- 13 h 02 min to 11 h 48 min
- Cloud cover
- 24%
- Humidity
- 30%
- Dew point
- 28°F
- Wind
- 6.0 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 | 79°F | 57°F | 100°F 1950 | 35°F 1932 | 3% | 0% |
| Sep 2 | 79°F | 57°F | 101°F 1950 | 27°F 1973 | 3% | 0% |
| Sep 3 | 78°F | 57°F | 103°F 1950 | 30°F 1964 | 3% | 0% |
| Sep 4 | 78°F | 56°F | 98°F 1955 | 31°F 1971 | 3% | 0% |
| Sep 5 | 78°F | 56°F | 100°F 2022 | 32°F 2000 | 4% | 0% |
| Sep 6 | 77°F | 56°F | 102°F 2022 | 31°F 2000 | 4% | 0% |
| Sep 7 | 77°F | 56°F | 100°F 2022 | 31°F 1901 | 4% | 0% |
| Sep 8 | 77°F | 55°F | 101°F 2022 | 26°F 1929 | 4% | 0% |
| Sep 9 | 77°F | 55°F | 99°F 2022 | 28°F 1928 | 4% | 0% |
| Sep 10 | 76°F | 55°F | 96°F 2021 | 26°F 1927 | 4% | 0% |
| Sep 11 | 76°F | 55°F | 98°F 1935 | 25°F 1931 | 4% | 0% |
| Sep 12 | 75°F | 54°F | 100°F 1935 | 27°F 1974 | 4% | 0% |
| Sep 13 | 75°F | 54°F | 95°F 1947 | 24°F 1928 | 4% | 0% |
| Sep 14 | 75°F | 54°F | 97°F 1937 | 25°F 1894 | 4% | 0% |
| Sep 15 | 74°F | 54°F | 99°F 1937 | 24°F 1970 | 4% | 0% |
| Sep 16 | 74°F | 53°F | 95°F 1932 | 25°F 1970 | 4% | 0% |
| Sep 17 | 74°F | 53°F | 99°F 1929 | 24°F 1965 | 4% | 0% |
| Sep 18 | 73°F | 53°F | 96°F 1929 | 20°F 1965 | 4% | 0% |
| Sep 19 | 73°F | 52°F | 93°F 1937 | 21°F 1978 | 4% | 0% |
| Sep 20 | 72°F | 52°F | 92°F 1935 | 23°F 1978 | 4% | 0% |
| Sep 21 | 72°F | 52°F | 92°F 1935 | 19°F 1895 | 4% | 0% |
| Sep 22 | 72°F | 51°F | 93°F 1949 | 17°F 1895 | 4% | 0% |
| Sep 23 | 71°F | 51°F | 92°F 1936 | 20°F 1895 | 4% | 0% |
| Sep 24 | 71°F | 51°F | 92°F 1947 | 24°F 1958 | 4% | 0% |
| Sep 25 | 70°F | 50°F | 94°F 1963 | 22°F 1926 | 4% | 1% |
| Sep 26 | 70°F | 50°F | 94°F 1963 | 21°F 1926 | 4% | 1% |
| Sep 27 | 69°F | 50°F | 93°F 1963 | 19°F 1926 | 4% | 1% |
| Sep 28 | 69°F | 49°F | 94°F 1963 | 23°F 1974 | 4% | 1% |
| Sep 29 | 69°F | 49°F | 93°F 1963 | 22°F 1925 | 4% | 1% |
| Sep 30 | 68°F | 48°F | 89°F 1943 | 17°F 1925 | 5% | 1% |
Chance of rain
- Chance of a wet day
- Chance of snowfall
Sunrise and sunset
Times for 2026, local time (PDT).
- September 1
- sunrise 6:27 AM, sunset 7:29 PM
- September 30
- sunrise 6:54 AM, sunset 6:42 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00268761 (Virginia City), public domain. Records: NOAA GHCN-Daily, station USC00261485, 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.