Sylvan Lake Weather Forecast
- 48
- 68
Chance Thunderstorms
- 53
- 70
Slight Chance Thunderstorms
- 61
- 83
Partly Sunny
- 50
- 79
Chance Thunderstorms
- 52
- 68
Partly Sunny
- 56
- 81
Slight Chance Thunderstorms
- 54
- 80
Slight Chance Thunderstorms
Today 4 Jun Central Black Hills
Partly cloudy with a chance of Showers and Thunderstorms. Some Thunderstorms may be severe with damaging Winds and large hail. Near steady temperature in the upper 60s. East Winds 5 to 10 Mph. Chance of rain 50 percent.
Tonight 4 Jun Central Black Hills
Mostly cloudy with a chance of Showers and Thunderstorms in the Evening, then partly cloudy with Showers likely with a slight chance of Thunderstorms after midnight. Some Thunderstorms may be severe with damaging Winds and large hail in the evening. Not as cool with Lows in the lower 50s. North Winds 5 to 10 Mph. Gusts up to 20 Mph in the evening. Chance of rain 60 percent.
Sylvan Lake Temperature Statistics
June Temperature
Custer, Custer County Airport (8.1 miles)
Lowest 1 June, 2026
41.6 °FAverage June
54.2 °FHighest 1 June, 2026
64.7 °F
Climate (2021–Present)
Custer, Custer County Airport (8.1 miles)
Average Low 2021–2026
33.6 °FAverage 2021–2026
45.4 °FAverage High 2021–2026
57 °F