In September, Cincinnati typically sees daytime highs of 26.6°C and overnight lows around 13.4°C. Compared to the annual average high of 18.1°C, September runs +8.5°C.
September in Cincinnati averages a daytime high of 26.6°C and an overnight low of 13.4°C.
September runs +8.5°C compared to Cincinnati's annual average high of 18.1°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 26.6°C and cooler evenings around 13.4°C.