Fairfield Weather Forecast
- 60
- 83
Sunny
- 58
- 82
Sunny
- 57
- 83
Mostly Sunny
- 57
- 83
Partly Sunny
- 59
- 83
Chance Rain Showers
- 56
- 74
Chance Thunderstorms
- 54
- 72
Chance Rain Showers
Today 14 Sep Walworth
Sunny. East Winds 5 to 10 Mph.
Tonight 14 Sep Walworth
Clear. Lows in the upper 50s. East Winds up to 5 Mph.
Fairfield Temperature Statistics
September Temperature
Janesville-Rock County (13 miles)
Lowest 7 September, 2025
39.2 °FAverage September
56.8 °FHighest 12 September, 2025
82.4 °F
Climate (2020–Present)
Janesville-Rock County (13 miles)
Average Low 2020–2025
40.4 °FAverage 2020–2025
48.7 °FAverage High 2020–2025
60.2 °F