Yellowstone Weather Forecast
- 62
- 82
Chance Thunderstorms
- 62
- 86
Mostly Sunny
- 62
- 86
Partly Sunny
- 62
- 87
Partly Sunny
- 61
- 84
Mostly Cloudy
- 58
- 79
Chance Rain Showers
Today 13 Sep Lafayette
Partly sunny. A 20 percent chance of light Showers and Thunderstorms in the morning. Highs in the lower 80s. South Winds 5 to 10 Mph.
Tonight 13 Sep Lafayette
Warmer. Mostly cloudy with a 40 percent chance of light Showers and Thunderstorms. Lows in the mid 60s. Southeast Winds 5 to 10 Mph.
Yellowstone Temperature Statistics
September Temperature
Iowa County Airport (14.3 miles)
Lowest 1 September, 2025
51.8 °FAverage September
61.5 °FHighest 1 September, 2025
71.6 °F
Climate (2020–Present)
Iowa County Airport (14.3 miles)
Average Low 2020–2025
41.6 °FAverage 2020–2025
50.2 °FAverage High 2020–2025
58.7 °F