Alton Weather Forecast

    • 56
    • 67

    Rain Likely

    • 57
    • 61

    Rain

    • 56
    • 67

    Rain

    • 53
    • 65

    Chance Rain Showers

    • 53
    • 68

    Mostly Cloudy

    • 55
    • 70

    Partly Sunny

Today 25 Sep Washington

Cloudy with a 50 percent chance of rain. Breezy with Highs in the mid 60s. Northeast Winds 20 to 25 Mph with Gusts up to 45 Mph.

Tonight 25 Sep Washington

Rain Likely, mainly in the evening. Windy with Lows in the mid 50s. Northeast Winds 20 to 30 Mph with Gusts up to 55 Mph. Chance of rain 70 percent.

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  • Temperature Real-Time

Alton Temperature Statistics

September Temperature

Westerly, Westerly State Airport (6.8 miles)

  • Lowest 15 September, 2026

    48 °F

  • Average September

    65.8 °F

  • Highest 4 September, 2026

    82 °F

Climate (2021–2026)

Westerly, Westerly State Airport (6.8 miles)

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  • Average Low 2021–2026

    44.2 °F

  • Average 2021–2026

    52.5 °F

  • Average High 2021–2026

    60.4 °F
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