Port Arthur Weather Forecast

    • 73
    • 90

    Mostly Sunny

    • 74
    • 91

    Mostly Sunny

    • 76
    • 90

    Partly Sunny

    • 75
    • 89

    Slight Chance Thunderstorms

    • 76
    • 88

    Chance Thunderstorms

    • 72
    • 90

    Chance Thunderstorms

Today 18 Sep Lower Jefferson

Mostly sunny. Highs in the upper 80s. Northeast Winds around 5 Mph, becoming southeast this afternoon.

Tonight 18 Sep Lower Jefferson

Mostly clear this Evening, then becoming partly cloudy. Lows in the lower 70s. Southeast Winds 5 to 10 Mph, becoming northeast after midnight.

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Port Arthur Temperature Statistics

September Temperature

Beaumont/Port Arthur Southeast Texas Regional Airport (6.8 miles)

  • Lowest 9 September, 2025

    61 °F

  • Average September

    80.3 °F

  • Highest 3 September, 2025

    93.9 °F

Climate (2020–Present)

Beaumont/Port Arthur Southeast Texas Regional Airport (6.8 miles)

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  • Average Low 2020–2025

    62 °F

  • Average 2020–2025

    70.4 °F

  • Average High 2020–2025

    80.5 °F
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