Marathon County Fairgrounds Weather Forecast

    • 43
    • 63

    Mostly Cloudy

    • 42
    • 64

    Mostly Sunny

    • 43
    • 66

    Mostly Sunny

    • 45
    • 66

    Mostly Cloudy

    • 45
    • 68

    Mostly Cloudy

    • 49
    • 67

    Chance Rain Showers

    • 50
    • 69

    Mostly Cloudy

Today 21 Sep Marathon

Partly cloudy. Lows in the upper 40s. Highs in the upper 60s.

Tonight 21 Sep Marathon

Mostly cloudy. Isolated Showers in the evening. Lows in the lower 40s. East wind 5 to 10 Mph.

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Marathon County Fairgrounds Temperature Statistics

September Temperature

Wausau Downtown Airport (1.9 miles)

  • Lowest 14 September, 2026

    40.6 °F

  • Average September

    66.3 °F

  • Highest 1 September, 2026

    89.7 °F

Climate (2021–2026)

Wausau Downtown Airport (1.9 miles)

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  • Average Low 2021–2026

    37.4 °F

  • Average 2021–2026

    46.8 °F

  • Average High 2021–2026

    56 °F
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