Harwinton Weather Forecast

    • 54
    • 77

    Mostly Cloudy

    • 52
    • 79

    Mostly Sunny

    • 54
    • 77

    Mostly Sunny

    • 54
    • 77

    Partly Sunny

    • 55
    • 77

    Mostly Cloudy

    • 57
    • 77

    Partly Sunny

    • 56
    • 80

    Partly Sunny

Today 13 Sep Southern Litchfield

Mostly sunny with a 20 percent chance of Showers. Near steady temperature in the upper 70s. South Winds around 5 Mph.

Tonight 13 Sep Southern Litchfield

Mostly cloudy. Patchy fog after midnight. Lows in the mid 50s. South Winds around 5 Mph in the Evening, becoming light and variable.

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Harwinton Temperature Statistics

September Temperature

Oxford, Waterbury-Oxford Airport (19.9 miles)

  • Lowest 8 September, 2025

    45 °F

  • Average September

    62.9 °F

  • Highest 6 September, 2025

    81 °F

Climate (2020–Present)

Oxford, Waterbury-Oxford Airport (19.9 miles)

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  • Average Low 2020–2025

    42.9 °F

  • Average 2020–2025

    51.2 °F

  • Average High 2020–2025

    59.6 °F
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