Fairfield Weather Forecast

    • 48
    • 61

    Mostly Cloudy

    • 46
    • 61

    Partly Sunny

    • 47
    • 64

    Partly Sunny

    • 48
    • 64

    Mostly Cloudy

    • 47
    • 65

    Mostly Cloudy

    • 48
    • 65

    Mostly Cloudy

Today 21 Sep Walworth

Cloudy. Scattered Sprinkles in the morning. Highs in the lower 60s. Northeast Winds 10 to 15 Mph.

Tonight 21 Sep Walworth

Mostly cloudy. Scattered Sprinkles in the evening. Scattered Sprinkles after midnight. Lows in the upper 40s. Northeast Winds 5 to 10 Mph.

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    67.1 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (13 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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