Steffan Reservoir Weather Forecast
- 60
- 88
Rain Showers Likely
- 40
- 78
Chance Rain Showers
- 38
- 62
Chance Rain Showers
- 44
- 63
Rain Showers Likely
- 42
- 60
Rain Showers
- 36
- 55
Chance Rain Showers
- 36
- 57
Partly Sunny
Today 22 Apr Knox
Sunny, windy with Highs in the upper 80s. South Winds 20 to 30 Mph with Gusts up to 40 Mph.
Tonight 22 Apr Knox
Mostly cloudy. Showers likely with a chance of Thunderstorms after midnight. Windy with Lows in the upper 50s. South Winds 20 to 30 Mph with Gusts up to 45 Mph. Chance of rain 70 percent.
Steffan Reservoir Temperature Statistics
April Temperature
Yankton, Chan Gurney Municipal Airport (11.2 miles)
Lowest 10 April, 2026
23 °FAverage April
47 °FHighest 16 April, 2026
87.1 °F
Climate (2021–Present)
Yankton, Chan Gurney Municipal Airport (11.2 miles)
Average Low 2021–2026
39.3 °FAverage 2021–2026
50.5 °FAverage High 2021–2026
61.8 °F