Alton Weather Forecast

    • 53
    • 76

    Increasing Clouds

    • 52
    • 74

    Partly Sunny

    • 58
    • 72

    Mostly Cloudy

    • 59
    • 75

    Dense Fog

    • 52
    • 79

    Mostly Sunny

    • 48
    • 69

    Partly Sunny

Today 15 Sep Washington

Mostly sunny. Highs in the mid 70s. Northeast Winds 5 to 10 Mph, becoming east in the afternoon.

Tonight 15 Sep Washington

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog. Lows in the mid 50s. East Winds around 5 Mph.

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Alton Temperature Statistics

September Temperature

Westerly, Westerly State Airport (6.8 miles)

  • Lowest 4 September, 2025

    48 °F

  • Average September

    63.7 °F

  • Highest 6 September, 2025

    78.1 °F

Climate (2020–Present)

Westerly, Westerly State Airport (6.8 miles)

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  • Average Low 2020–2025

    44.3 °F

  • Average 2020–2025

    52.5 °F

  • Average High 2020–2025

    60.4 °F
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