Click on a day for an hourly weather forecast
The temperatures in Dayton in September are comfortable with low of 14°C and and high up to 24°C.
You can expect about 3 to 8 days of rain in Dayton during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Dayton in September 2025.
If you’re planning to visit Dayton in the near future, we highly recommend that you review the 14 day weather forecast for Dayton before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 1° / -6° | 6 | 11 | 14 | 79 mm | Awful | Dayton in January |
| February | 3° / -4° | 6 | 11 | 11 | 97 mm | Awful | Dayton in February |
| March | 10° / 1° | 8 | 17 | 6 | 110 mm | Awful | Dayton in March |
| April | 16° / 6° | 8 | 20 | 2 | 136 mm | Bad | Dayton in April |
| May | 22° / 13° | 8 | 23 | 0 | 155 mm | Ok | Dayton in May |
| June | 26° / 17° | 8 | 22 | 0 | 146 mm | Good | Dayton in June |
| July | 28° / 18° | 8 | 23 | 0 | 139 mm | Good | Dayton in July |
| August | 27° / 17° | 6 | 25 | 0 | 112 mm | Perfect | Dayton in August |
| September | 24° / 14° | 5 | 25 | 0 | 97 mm | Perfect | Dayton in September |
| October | 18° / 8° | 4 | 26 | 0 | 91 mm | Good | Dayton in October |
| November | 10° / 2° | 5 | 22 | 3 | 87 mm | Bad | Dayton in November |
| December | 5° / -1° | 7 | 14 | 10 | 96 mm | Awful | Dayton in December |