In September, Dortmund typically sees daytime highs of 19.2°C and overnight lows around 9.8°C. Compared to the annual average high of 13.6°C, September runs +5.6°C.
September in Dortmund averages a daytime high of 19.2°C and an overnight low of 9.8°C.
September runs +5.6°C compared to Dortmund's annual average high of 13.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 19.2°C and cooler evenings around 9.8°C.