In September, Kotka typically sees daytime highs of 14.2°C and overnight lows around 7.8°C. Compared to the annual average high of 7.6°C, September runs +6.6°C.
September in Kotka averages a daytime high of 14.2°C and an overnight low of 7.8°C.
September runs +6.6°C compared to Kotka's annual average high of 7.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 14.2°C and cooler evenings around 7.8°C.