Charleston Weather Forecast

    • 50
    • 76

    Mostly Cloudy

    • 56
    • 78

    Partly Sunny

    • 37
    • 68

    Mostly Sunny

    • 34
    • 64

    Sunny

    • 44
    • 69

    Mostly Sunny

    • 52
    • 76

    Partly Sunny

    • 55
    • 81

    Partly Sunny

Today 17 Sep Southern Penobscot

Patchy fog this morning. Partly sunny. Highs in the mid 70s. South Winds 5 to 10 Mph.

Tonight 17 Sep Southern Penobscot

Partly cloudy this Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower 50s. South Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Charleston Temperature Statistics

September Temperature

Bangor, Bangor International Airport (22.4 miles)

  • Lowest 11 September, 2025

    42.1 °F

  • Average September

    61.2 °F

  • Highest 1 September, 2025

    80.1 °F

Climate (2020–Present)

Bangor, Bangor International Airport (22.4 miles)

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  • Average Low 2020–2025

    38 °F

  • Average 2020–2025

    47.6 °F

  • Average High 2020–2025

    57.1 °F
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