Cincinnati, OH weather in September
Cincinnati is warm in September, with some rain: highs average 80°F and nights drop to about 56°F. There are about 9 days with rain. A good month for most outdoor plans.
- Normal high
- 80°F
- Normal low
- 56°F
- Wet days
- 9
- 3.1 in total
- Muggy days
- 7
- dew point 65°F+
How September changes from start to finish
| September 1 | September 30 | |
|---|---|---|
| Normal high | 84°F | 74°F |
| Normal low | 61°F | 50°F |
| Chance of a wet day | 29% | 28% |
| Sunrise / sunset | 7:06 am / 8:09 pm | 7:33 am / 7:22 pm |
| Daylight | 13.0 h | 11.8 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Eastern Time).
A typical September day
- 6 am59°Fdew point 57°F
- 9 am66°Fdew point 59°F
- Noon75°Fdew point 59°F
- 3 pm78°Fdew point 58°F
- 6 pm75°Fdew point 59°F
- 9 pm65°Fdew point 59°F
NOAA hourly normals (local standard time) from Cincinnati Lunken Airport (5 mi away); average wind 4 mph; clear or few clouds in 61% of daytime hours, mostly cloudy or overcast in 29%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F11 of 30
- Hot dayshigh 90°F or more4 of 30
- Muggy daysdaily mean dew point 65°F or more7 of 30
- Wet daysat least 0.01 in of rain or melted snow9 of 30
- Notable rainat least 0.10 in5 of 30
- Freezing nightslow 32°F or below0 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per September, counted from daily records for each year 1991-2020.
Rain in September
Normal precipitation is 3.1 in; a dry September brings about 1.6 in and a wet one about 4.6 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more.
How September varies from year to year
- Warmest September, 1991-20202007: average high 87°F
- Coolest September2006: average high 74°F
- Wettest September2018: 7.4 in
- Driest September2019: 0.4 in
- Highest reading99°F (September 3, 2011)
- Lowest reading35°F (September 23, 1995)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
September compared with August and October
| August | September | October | |
|---|---|---|---|
| Normal high | 86°F | 80°F | 68°F |
| Normal low | 64°F | 56°F | 44°F |
| Wet days | 10 | 9 | 9 |
| Comfortable days | 3 | 11 | 15 |
| Daylight | 13.7 h | 12.4 h | 11.2 h |
Highs change by -6°F from August and -12°F into October.
Nearby alternatives in September
- Cooler: South Bend, IN200 mi · high 74°F · 10 wet days
How Cincinnati ranks in September
- Normal high202nd warmest of 378 cities; 1st of 6 in Ohio
- Wet days231st driest of 378
- Comfortable days141st most of 342
What to pack for Cincinnati in September
- A rain jacket or umbrella – rain on about 9 days
Heating and cooling
September has 52 heating degree days and 136 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Cincinnati in September?
The normal high is 80°F and the normal low is 56°F. From 1991 to 2020 the hottest September reading was 99°F (most recently on September 3, 2011).
Does it rain a lot in Cincinnati in September?
About 9 days in September have at least 0.01 in of precipitation, and the normal total is 3.1 in. The wettest September in 1991-2020 was in 2018 (7.4 in); the driest was in 2019 (0.4 in).
Is September a good time to visit Cincinnati?
September ranks 4th of 12 months on our comfort score for Cincinnati (62 out of 100). It has about 11 comfortable days and about 4 days at 90°F or hotter. The best months are April, May and October.
Where the numbers come from
- Temperature, rain, frost dates, humidity and wind by hour and cloud cover: Cincinnati Lunken Airport (USW00093812), 5.2 mi E of the city center, 490 ft (62 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Snowfall and snow depth: Cincinnati Northern Ky Airport (USW00093814), 9.4 mi WSW of the city center, 869 ft (317 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Cina Muni Apt/Lukn Fd Apt (724297-93812), 5.3 mi E of the city center, 475 ft (77 ft lower than the city). Hourly observations, 1991-2020.