Fairfield Weather Forecast

    • 55
    • 65

    Mostly Cloudy

    • 48
    • 65

    Mostly Cloudy

    • 49
    • 66

    Mostly Cloudy

    • 48
    • 66

    Mostly Cloudy

    • 51
    • 68

    Partly Sunny

Today 24 Sep Walworth

Partly sunny. Highs in the mid 60s. East Winds up to 10 Mph.

Tonight 24 Sep Walworth

Mostly cloudy. A 20 percent chance of light rain Showers early in the morning. Lows in the mid 50s. East Winds up to 5 Mph through around midnight becoming calm.

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    65.8 °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

    60.2 °F
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