Fairfield Weather Forecast

    • 50
    • 73

    Partly Sunny

    • 60
    • 74

    Rain Showers Likely

    • 62
    • 71

    Rain Showers Likely

    • 50
    • 69

    Chance Rain Showers

    • 44
    • 63

    Chance Rain Showers

    • 47
    • 63

    Slight Chance Rain Showers

Today 28 Sep Walworth

Partly sunny in the morning then clearing. Highs in the lower 70s. Northeast Winds up to 5 Mph.

Tonight 28 Sep Walworth

Partly cloudy. Lows in the lower 50s. East Winds up to 5 Mph through around midnight becoming calm.

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  • Temperature Real-Time

Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    64.8 °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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