In September, Port Arthur typically sees daytime highs of 30.1°C and overnight lows around 22.0°C. Compared to the annual average high of 24.3°C, September runs +5.7°C.
September in Port Arthur averages a daytime high of 30.1°C and an overnight low of 22.0°C.
September runs +5.7°C compared to Port Arthur's annual average high of 24.3°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 30.1°C and cooler evenings around 22.0°C.