March in Port Arthur averages a daily high of 22.9°C with nights around 12°C. Expect roughly 7.8 wet days totalling 88.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Port Arthur is February–April.
Based on PORT ARTHUR SE TX REGIONAL AIRPORT, TX US (11km), 1995–2024. 30 years of March data.