Bismark Lake Weather Forecast
- 57
- 83
Thunderstorms
- 58
- 82
Chance Thunderstorms
- 64
- 89
Mostly Sunny
- 66
- 97
Hot
- 52
- 84
Chance Rain Showers
- 53
- 72
Chance Rain Showers
- 59
- 79
Slight Chance Thunderstorms
Today 30 Jul Central Black Hills
Partly cloudy with a chance of Showers and Thunderstorms. Some Thunderstorms may be severe with damaging Winds and large hail. Highs in the upper 70s to mid 80s. North Winds 5 to 10 Mph with Gusts up to 30 Mph. Chance of rain 50 percent.
Tonight 30 Jul Central Black Hills
Mostly clear. A slight chance of Showers and Thunderstorms this evening. Some Thunderstorms may be severe with damaging Winds and large hail. Lows in the mid 50s. North Winds 5 to 10 Mph. Gusts up to 25 Mph this evening. Chance of rain 20 percent.
Bismark Lake Temperature Statistics
July Temperature
Custer, Custer County Airport (5.6 miles)
Lowest 3 July, 2026
50.6 °FAverage July
71.5 °FHighest 25 July, 2026
96.7 °F
Climate (2021–2026)
Custer, Custer County Airport (5.6 miles)
Average Low 2021–2026
33.5 °FAverage 2021–2026
45.3 °FAverage High 2021–2026
56.9 °F