Fairfield Weather Forecast

    • 55
    • 76

    Rain Showers Likely

    • 59
    • 71

    Rain Showers

    • 57
    • 76

    Chance Rain Showers

    • 64
    • 74

    Chance Rain Showers

    • 61
    • 79

    Chance Rain Showers

    • 56
    • 74

    Chance Rain Showers

Today 15 Sep Walworth

Cloudy. Isolated Thunderstorms in the morning. Showers in the Morning, then slight chance of Showers and Thunderstorms early in the afternoon. Highs in the mid 70s. Southwest Winds 5 to 15 Mph. Chance of precipitation 90 percent.

Tonight 15 Sep Walworth

Mostly cloudy in the evening then becoming partly cloudy. Lows in the mid 50s. North Winds up to 5 Mph.

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  • Temperature Forecast NOAA

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 11 September, 2026

    53.6 °F

  • Average September

    70.3 °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

    60.3 °F
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