In September, Turku typically sees daytime highs of 14.3°C and overnight lows around 6.6°C. Compared to the annual average high of 8.4°C, September runs +5.9°C.
September in Turku averages a daytime high of 14.3°C and an overnight low of 6.6°C.
September runs +5.9°C compared to Turku's annual average high of 8.4°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 14.3°C and cooler evenings around 6.6°C.