Weatheo

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

78 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.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January17°C7°C-11°C / 27°C
56 mm
75%14 km/h
February20°C10°C-11°C / 29°C
32 mm
77%14 km/h
March24°C13°C-1°C / 31°C
39 mm
75%14 km/h
April26°C16°C3°C / 32°C
61 mm
76%15 km/h
May29°C20°C6°C / 35°C
68 mm
78%13 km/h
June32°C24°C17°C / 39°C
71 mm
79%11 km/h
July33°C24°C18°C / 38°C
57 mm
79%9 km/h
August33°C24°C19°C / 42°C
62 mm
76%10 km/h
September32°C22°C11°C / 39°C
78 mm
76%9 km/h
October28°C17°C2°C / 35°C
57 mm
75%11 km/h
November22°C12°C-2°C / 31°C
50 mm
77%12 km/h
December20°C10°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 682 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 78 mm, roughly 2× the rainfall of the driest month (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.

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