Fairfield Weather Forecast

    • 58
    • 80

    Decreasing Clouds

    • 59
    • 80

    Partly Sunny

    • 70
    • 84

    Chance Rain Showers

    • 58
    • 83

    Partly Sunny

    • 54
    • 77

    Partly Sunny

    • 58
    • 79

    Partly Sunny

Today 6 Sep Walworth

Mostly sunny. Patchy fog in the morning. Highs in the upper 70s. East Winds up to 10 Mph.

Tonight 6 Sep Walworth

Mostly clear. Lows in the upper 50s. East Winds up to 5 Mph.

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 1 September, 2026

    69.8 °F

  • Average September

    77.2 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (13 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
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