In September, Ostroleka typically sees daytime highs of 18.7°C and overnight lows around 7.4°C. Compared to the annual average high of 11.9°C, September runs +6.8°C.
September in Ostroleka averages a daytime high of 18.7°C and an overnight low of 7.4°C.
September runs +6.8°C compared to Ostroleka's annual average high of 11.9°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.7°C and cooler evenings around 7.4°C.