Fairfield Weather Forecast

    • 53
    • 82

    Becoming Sunny

    • 46
    • 68

    Chance Rain Showers

    • 61
    • 70

    Mostly Cloudy

    • 57
    • 78

    Rain Showers Likely

    • 56
    • 70

    Chance Rain Showers

    • 53
    • 72

    Chance Rain Showers

Today 12 Sep Walworth

Partly sunny. Highs in the lower 80s. West Winds 5 to 15 Mph.

Tonight 12 Sep Walworth

Mostly clear. Lows in the mid 50s. Northwest Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 7 September, 2026

    55.4 °F

  • Average September

    72.2 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (13 miles)

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  • Average Low 2021–2026

    40.4 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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