Cincinnati Weather in September
September in Cincinnati brings high temperatures, with daytime highs of 27°C (81°F) and nights around 14°C (57°F). Quite a bit of rainfall is expected, around 98 mm (3.9 in), so pack an umbrella.
Rainfall in Cincinnati in September
This month experiences about 9 days of rain according to historical data, averaging 98 mm (3.9 in). The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Cincinnati in September
Cincinnati in September has perfect weather. Days reach 27°C (81°F) and nights cool to 14°C (57°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 14°C (57°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Cincinnati in September
There are approximately 231 hours of sunshine this month, resulting in mostly clear days.If you favor pleasant temperatures and minimal rainfall, September is one of the best months to visit Cincinnati.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Cincinnati's climate page.
Cincinnati Temperature in September
Min Temperature
14°C (57°F)
Max Temperature
27°C (81°F)
Chance of Rain
30%
Precipitation
98 mm (3.9 in)
Rainy days
9 days
Humidity
72%
Sunshine
231 hours
Percentage Sunshine
63%
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Cincinnati typically drop from around 28°C (82°F) at the start of September to approximately 23°C (73°F) by the end. Nights are cool, with lows typically ranging from 11°C (52°F) to 17°C (63°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Cincinnati in September
Browse day-by-day weather records for Cincinnati spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Cincinnati historical weather extremes in September
Our historical data for Cincinnati spans 1976 to 2025, revealing these weather extremes.
- The hottest September day on record in Cincinnati reached 37°C (99°F) (September 2, 2011).
- The coldest September day was on September 25, 2001, with a maximum of 13°C (55°F).
- The lowest overnight temperature recorded in September was 2°C (36°F) (September 30, 1993).
- The wettest September day on record brought 64 mm (2.5 in) of precipitation to Cincinnati (September 27, 2024).
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Cincinnati in September
Warm but pleasant conditions in Cincinnati in September. Focus on lightweight, maybe with natural fabrics, cotton blend shirts, comfortable shorts, and breathable footwear. A light cover-up for sun protection is smart too. Expect heavy rainfall, so bring good rain protection and waterproof bags. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.What To Do in Cincinnati in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Cincinnati's climate page.
Temperature Rainfall Sunshine Humidity
See the full Cincinnati climate overview or explore weather in the United States of America.
