In September, Siegen typically sees daytime highs of 17.2°C and overnight lows around 7.9°C. Compared to the annual average high of 11.5°C, September runs +5.7°C.
September in Siegen averages a daytime high of 17.2°C and an overnight low of 7.9°C.
September runs +5.7°C compared to Siegen's annual average high of 11.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 17.2°C and cooler evenings around 7.9°C.