Otter Lake Weather Forecast

    • 61
    • 88

    Partly Sunny

    • 60
    • 88

    Mostly Sunny

    • 70
    • 94

    Mostly Sunny

    • 65
    • 96

    Rain Showers Likely

    • 58
    • 83

    Slight Chance Rain Showers

    • 62
    • 86

    Slight Chance Thunderstorms

    • 64
    • 90

    Slight Chance Thunderstorms

Today 6 Sep Macoupin

Sunny and not as warm. Near steady temperature in the upper 80s. Northeast Winds 5 to 10 Mph.

Tonight 6 Sep Macoupin

Partly cloudy this Evening, then becoming mostly cloudy. Lows in the lower 60s. East Winds 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Otter Lake Temperature Statistics

September Temperature

Litchfield Municipal Airport (21.1 miles)

  • Lowest 1 September, 2026

    67.6 °F

  • Average September

    82.8 °F

  • Highest 4 September, 2026

    97.7 °F

Climate (2021–2026)

Litchfield Municipal Airport (21.1 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    54.8 °F

  • Average High 2021–2026

    64.5 °F
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