Jamestown Weather Forecast
- 63
- 85
Partly Sunny
- 62
- 85
Partly Sunny
- 61
- 84
Slight Chance Thunderstorms
- 61
- 83
Chance Thunderstorms
- 60
- 78
Chance Rain Showers
- 60
- 74
Chance Rain Showers
Today 15 Sep Grant
Mostly sunny. Highs in the mid 80s. Southeast Winds 5 to 10 Mph.
Tonight 15 Sep Grant
Partly cloudy. Lows in the lower 60s. Southeast Winds around 5 Mph.
Jamestown Temperature Statistics
September Temperature
Platteville Municipal Airport (8.7 miles)
Lowest 7 September, 2025
41 °FAverage September
60.9 °FHighest 12 September, 2025
83.1 °F
Climate (2020–Present)
Platteville Municipal Airport (8.7 miles)
Average Low 2020–2025
40.6 °FAverage 2020–2025
49.7 °FAverage High 2020–2025
58.5 °F