In September, Suwalki typically sees daytime highs of 17.4°C and overnight lows around 7.0°C. Compared to the annual average high of 10.6°C, September runs +6.8°C.
September in Suwalki averages a daytime high of 17.4°C and an overnight low of 7.0°C.
September runs +6.8°C compared to Suwalki's annual average high of 10.6°C, ranking #5 of 12 months by warmth.
Plan for daytime highs near 17.4°C and cooler evenings around 7.0°C.