In September, Iserlohn typically sees daytime highs of 18.1°C and overnight lows around 9.2°C. Compared to the annual average high of 12.5°C, September runs +5.6°C.
September in Iserlohn averages a daytime high of 18.1°C and an overnight low of 9.2°C.
September runs +5.6°C compared to Iserlohn's annual average high of 12.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.1°C and cooler evenings around 9.2°C.