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Port Arthur Weather by Month
Average temperatures, rainfall and humidity for Port Arthur, United States, month by month, built from OpenWeather's historical records. Use it to see what a typical Port Arthur month looks like before you travel — then check the live Port Arthur forecast for the days ahead.
Warmest month
August
33°C average high
Coolest month
January
7°C average low
Wettest month
September
73 mm of rain
Driest month
February
32 mm of rain
Average temperature and rainfall in Port Arthur by month
Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.
| Month | Avg high | Avg low | Record low / high | Rainfall | Humidity | Wind |
|---|---|---|---|---|---|---|
| January | 17°C | 7°C | -11°C / 27°C | 56 mm | 75% | 14 km/h |
| February | 20°C | 10°C | -11°C / 29°C | 32 mm | 77% | 14 km/h |
| March | 24°C | 13°C | -1°C / 31°C | 39 mm | 75% | 14 km/h |
| April | 26°C | 16°C | 3°C / 32°C | 61 mm | 76% | 15 km/h |
| May | 29°C | 20°C | 6°C / 35°C | 68 mm | 78% | 13 km/h |
| June | 32°C | 24°C | 17°C / 39°C | 71 mm | 79% | 11 km/h |
| July | 33°C | 24°C | 18°C / 38°C | 57 mm | 79% | 9 km/h |
| August | 33°C | 24°C | 19°C / 42°C | 62 mm | 76% | 10 km/h |
| September | 32°C | 22°C | 11°C / 39°C | 73 mm | 76% | 9 km/h |
| October | 28°C | 17°C | 2°C / 35°C | 57 mm | 75% | 11 km/h |
| November | 22°C | 12°C | -2°C / 31°C | 50 mm | 77% | 12 km/h |
| December | 20°C | 10°C | -9°C / 28°C | 51 mm | 79% | 13 km/h |
Best time to visit Port Arthur
The most comfortable time to visit Port Arthur is generally March to April and November, balancing mild daytime temperatures against the driest stretch of the year. The city has a moderate seasonal swing and rain concentrates around September, totalling about 677 mm a year.
Travellers who prefer heat should aim for August, when highs average 33°C. September is the month to avoid if rain would spoil your plans — it averages 73 mm, roughly 2× the rainfall of February.
Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Port Arthur forecast for what is happening now.