In September, Lomza typically sees daytime highs of 18.0°C and overnight lows around 7.8°C. Compared to the annual average high of 11.2°C, September runs +6.8°C.
September in Lomza averages a daytime high of 18.0°C and an overnight low of 7.8°C.
September runs +6.8°C compared to Lomza's annual average high of 11.2°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 18.0°C and cooler evenings around 7.8°C.