In September, Siemianowice Slaskie typically sees daytime highs of 18.7°C and overnight lows around 8.3°C. Compared to the annual average high of 12.3°C, September runs +6.4°C.
September in Siemianowice Slaskie averages a daytime high of 18.7°C and an overnight low of 8.3°C.
September runs +6.4°C compared to Siemianowice Slaskie's annual average high of 12.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.7°C and cooler evenings around 8.3°C.