Mont Belvieu Weather Forecast

    • 71
    • 90

    Slight Chance Thunderstorms

    • 71
    • 90

    Mostly Sunny

    • 73
    • 89

    Slight Chance Thunderstorms

    • 74
    • 88

    Chance Thunderstorms

    • 73
    • 87

    Chance Thunderstorms

    • 71
    • 86

    Chance Thunderstorms

Today 18 Sep Chambers

Sunny with a slight chance of Showers and Thunderstorms. Highs around 90. Northeast Winds around 5 Mph, becoming southeast this afternoon. Chance of rain 20 percent.

Tonight 18 Sep Chambers

Partly cloudy. Lows in the lower 70s. Southeast Winds 5 to 10 Mph, becoming east after midnight.

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Mont Belvieu Temperature Statistics

September Temperature

Houston / Ellington (23.6 miles)

  • Lowest 9 September, 2025

    68 °F

  • Average September

    81.7 °F

  • Highest 3 September, 2025

    95 °F

Climate (2020–Present)

Houston / Ellington (23.6 miles)

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  • Average Low 2020–2025

    63.7 °F

  • Average 2020–2025

    71.3 °F

  • Average High 2020–2025

    79.7 °F
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