Fairfield Weather Forecast

    • 60
    • 81

    Chance Thunderstorms

    • 55
    • 78

    Partly Sunny

    • 59
    • 79

    Mostly Sunny

    • 59
    • 78

    Chance Rain Showers

    • 54
    • 76

    Slight Chance Thunderstorms

    • 55
    • 75

    Partly Sunny

    • 58
    • 76

    Partly Sunny

Today 18 Aug Walworth

Showers with Thunderstorms likely. Some Thunderstorms may be severe with damaging Winds and large hail. Southwest Winds 5 to 15 Mph. Chance of precipitation 90 percent.

Tonight 18 Aug Walworth

Mostly cloudy until early morning then becoming partly cloudy. A 50 percent chance of light Showers and Thunderstorms through around midnight. Lows in the lower 60s. West Winds up to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Fairfield Temperature Statistics

August Temperature

Janesville-Rock County (13 miles)

  • Lowest 3 August, 2026

    53.6 °F

  • Average August

    70 °F

  • Highest 4 August, 2026

    84.2 °F

Climate (2021–2026)

Janesville-Rock County (13 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    40.3 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    60.3 °F
Get WillyWeather+ to remove ads