Steffan Reservoir Weather Forecast
- 56
- 84
Mostly Sunny
- 61
- 89
Chance Rain Showers
- 40
- 79
Chance Thunderstorms
- 38
- 62
Partly Sunny
- 42
- 61
Chance Rain Showers
- 42
- 60
Chance Rain Showers
- 37
- 56
Chance Rain Showers
Today 21 Apr Knox
Sunny. Highs in the mid 80s. Northeast Winds around 5 Mph.
Tonight 21 Apr Knox
Mostly clear. Not as cool with Lows in the upper 50s. Southeast Winds 5 to 10 Mph with Gusts up to 25 Mph.
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