Port Arthur's winters are mild, with January averaging around 12°C and February even cooler at 10°C, but temperatures can drop as low as -1°C. Spring arrives in March, bringing temperatures up to 27°C on average, while April and May see continued warming, reaching averages of 20°C and 24°C respectively. Summer is hot, with June through August temperatures consistently above 28°C, peaking at 34°C in July and August. Autumn brings a return to milder temperatures, with September averaging 26°C before cooling down to around 17°C by November.