Fairfield Weather Forecast

    • 71
    • 91

    Chance Thunderstorms

    • 68
    • 87

    Rain Showers Likely

    • 68
    • 87

    Chance Rain Showers

    • 64
    • 85

    Slight Chance Thunderstorms

    • 63
    • 83

    Slight Chance Thunderstorms

    • 62
    • 81

    Mostly Cloudy

    • 66
    • 81

    Chance Rain Showers

Today 2 Sep Walworth

Partly sunny with scattered light Showers and slight chance of Thunderstorms. Heat index Readings 96 to 101. Southwest Winds 5 to 10 Mph. Chance of precipitation 20 percent.

Tonight 2 Sep Walworth

Partly cloudy. Scattered Sprinkles in the Evening, then chance of light Showers and slight chance of Thunderstorms in the late evening and overnight. Lows in the lower 70s. South Winds up to 5 Mph. Chance of precipitation 40 percent.

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

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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

    60.3 °F
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