In September, Koszalin typically sees daytime highs of 18.3°C and overnight lows around 8.3°C. Compared to the annual average high of 11.8°C, September runs +6.5°C.
September in Koszalin averages a daytime high of 18.3°C and an overnight low of 8.3°C.
September runs +6.5°C compared to Koszalin's annual average high of 11.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.3°C and cooler evenings around 8.3°C.