In September, Frankfurt am Main typically sees daytime highs of 19.8°C and overnight lows around 10.2°C. Compared to the annual average high of 13.8°C, September runs +6.0°C.
September in Frankfurt am Main averages a daytime high of 19.8°C and an overnight low of 10.2°C.
September runs +6.0°C compared to Frankfurt am Main's annual average high of 13.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.8°C and cooler evenings around 10.2°C.