In September, Zwolle typically sees daytime highs of 18.4°C and overnight lows around 9.2°C. Compared to the annual average high of 12.8°C, September runs +5.6°C.
September in Zwolle averages a daytime high of 18.4°C and an overnight low of 9.2°C.
September runs +5.6°C compared to Zwolle's annual average high of 12.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.4°C and cooler evenings around 9.2°C.