In September, Gdynia typically sees daytime highs of 17.9°C and overnight lows around 9.5°C. Compared to the annual average high of 11.3°C, September runs +6.6°C.
September in Gdynia averages a daytime high of 17.9°C and an overnight low of 9.5°C.
September runs +6.6°C compared to Gdynia's annual average high of 11.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 17.9°C and cooler evenings around 9.5°C.