In September, Gniezno typically sees daytime highs of 18.6°C and overnight lows around 8.7°C. Compared to the annual average high of 11.9°C, September runs +6.6°C.
September in Gniezno averages a daytime high of 18.6°C and an overnight low of 8.7°C.
September runs +6.6°C compared to Gniezno's annual average high of 11.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.6°C and cooler evenings around 8.7°C.