Dorchester Weather Forecast

    • 68
    • 94

    Mostly Sunny

    • 67
    • 97

    Slight Chance Thunderstorms

    • 67
    • 92

    Partly Sunny

    • 65
    • 92

    Partly Sunny

    • 65
    • 92

    Partly Sunny

    • 63
    • 87

    Chance Rain Showers

    • 59
    • 85

    Slight Chance Thunderstorms

Today 13 Sep Macoupin

Mostly sunny. Hot. Near steady temperature in the mid 90s. Southwest Winds around 5 Mph.

Tonight 13 Sep Macoupin

Mostly clear this Evening, then becoming partly cloudy. Lows around 70. Southwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Dorchester Temperature Statistics

September Temperature

Litchfield Municipal Airport (12.4 miles)

  • Lowest 7 September, 2025

    38.5 °F

  • Average September

    63.9 °F

  • Highest 11 September, 2025

    87.4 °F

Climate (2020–Present)

Litchfield Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    54.2 °F

  • Average High 2020–2025

    63.8 °F
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