Fairfield Weather Forecast

    • 60
    • 70

    Rain Showers

    • 56
    • 70

    Rain Showers

    • 49
    • 64

    Chance Rain Showers

    • 46
    • 61

    Chance Rain Showers

    • 45
    • 60

    Mostly Cloudy

    • 45
    • 63

    Partly Sunny

Today 18 Sep Walworth

Mostly cloudy. A 20 percent chance of light rain Showers late in the afternoon. Highs in the upper 60s. East Winds 5 to 15 Mph.

Tonight 18 Sep Walworth

Chance of Showers through around midnight. Chance of Thunderstorms in the late evening and overnight. Showers after midnight. Locally heavy rainfall possible after midnight. Lows in the upper 50s. East Winds 10 to 15 Mph. Chance of precipitation near 100 percent.

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  • Temperature Forecast NOAA

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Fairfield Temperature Statistics

September Temperature

Janesville-Rock County (13 miles)

  • Lowest 14 September, 2026

    42.8 °F

  • Average September

    67.8 °F

  • Highest 1 September, 2026

    91.4 °F

Climate (2021–2026)

Janesville-Rock County (13 miles)

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  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.2 °F
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