In September, Gliwice typically sees daytime highs of 18.9°C and overnight lows around 8.7°C. Compared to the annual average high of 12.5°C, September runs +6.4°C.
September in Gliwice averages a daytime high of 18.9°C and an overnight low of 8.7°C.
September runs +6.4°C compared to Gliwice's annual average high of 12.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.9°C and cooler evenings around 8.7°C.