Yellowstone Lake Weather Forecast
- 60
- 77
Mostly Sunny
- 58
- 78
Partly Sunny
- 63
- 79
Chance Thunderstorms
- 52
- 75
Mostly Sunny
- 48
- 69
Partly Sunny
- 46
- 66
Partly Sunny
- 47
- 69
Mostly Sunny
Today 20 Aug Lafayette
Mostly sunny. Northeast Winds 5 to 10 Mph.
Tonight 20 Aug Lafayette
Partly cloudy. Areas of fog after midnight. Lows in the lower 60s. Northeast Winds around 5 Mph.
Yellowstone Lake Temperature Statistics
August Temperature
Iowa County Airport (15.5 miles)
Lowest 1 August, 2025
50 °FAverage August
69.6 °FHighest 8 August, 2025
84.2 °F
Climate (2020–Present)
Iowa County Airport (15.5 miles)
Average Low 2020–2025
41.7 °FAverage 2020–2025
50.2 °FAverage High 2020–2025
58.8 °F