Fairfield Weather Forecast
- 40
- 61
Decreasing Clouds
- 41
- 63
Partly Sunny
- 42
- 65
Mostly Sunny
- 51
- 71
Partly Sunny
- 54
- 75
Slight Chance Rain Showers
- 51
- 76
Partly Sunny
Today 5 Sep Walworth
Partly sunny. Highs in the lower 60s. West Winds 15 to 20 Mph with Gusts to around 35 Mph.
Tonight 5 Sep Walworth
Colder. Mostly clear. Lows in the lower 40s. West Winds 5 to 10 Mph.
Fairfield Temperature Statistics
September Temperature
Janesville-Rock County (13 miles)
Lowest 3 September, 2025
46.4 °FAverage September
59.3 °FHighest 1 September, 2025
77 °F
Climate (2020–Present)
Janesville-Rock County (13 miles)
Average Low 2020–2025
40.5 °FAverage 2020–2025
48.7 °FAverage High 2020–2025
60.2 °F