Sibley Lake Weather Forecast
- 36
- 55
Mostly Sunny
- 40
- 58
Partly Sunny
- 41
- 64
Mostly Sunny
- 35
- 62
Chance Rain Showers
- 35
- 52
Slight Chance Rain Showers
- 39
- 61
Mostly Sunny
Today 18 Sep Northeast Bighorn Mountains
Sunny. Highs in the upper 50s. North Winds 5 to 15 Mph.
Tonight 18 Sep Northeast Bighorn Mountains
Mostly clear. Lows in the upper 30s. Southwest Winds 5 to 10 Mph.
Sibley Lake Temperature Statistics
September Temperature
Sheridan County Airport (22.4 miles)
Lowest 6 September, 2025
30.9 °FAverage September
62.5 °FHighest 1 September, 2025
89.1 °F
Climate (2020–Present)
Sheridan County Airport (22.4 miles)
Average Low 2020–2025
33.1 °FAverage 2020–2025
47.1 °FAverage High 2020–2025
61.4 °F