Alton Weather Forecast

    • 55
    • 74

    Rain Showers

    • 58
    • 79

    Partly Sunny

    • 42
    • 71

    Sunny

    • 41
    • 67

    Sunny

    • 48
    • 71

    Mostly Sunny

    • 55
    • 77

    Partly Sunny

Today 17 Sep Belknap

Mostly cloudy this Morning, then becoming partly sunny. Highs in the lower 70s. Light and variable Winds.

Tonight 17 Sep Belknap

Partly cloudy in the Evening, then mostly cloudy with isolated Showers after midnight. Patchy fog after midnight. Lows in the lower 50s. Light and variable Winds. Chance of rain 20 percent.

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Alton Temperature Statistics

September Temperature

Laconia, Laconia Municipal Airport (9.9 miles)

  • Lowest 10 September, 2025

    44.1 °F

  • Average September

    62.9 °F

  • Highest 3 September, 2025

    80.1 °F

Climate (2020–Present)

Laconia, Laconia Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    39.4 °F

  • Average 2020–2025

    48.4 °F

  • Average High 2020–2025

    57.3 °F
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