Sylvan Lake Weather Forecast
- 30
- 50
Thunderstorms
- 29
- 55
Partly Sunny
- 31
- 64
Mostly Sunny
- 34
- 67
Partly Sunny
- 35
- 63
Isolated Thunderstorms
- 33
- 58
Isolated Thunderstorms
Today 16 Sep Yellowstone National Park
Widespread fog this morning. Mostly cloudy with numerous rain Showers. Scattered Thunderstorms this afternoon. Some Thunderstorms may produce gusty Winds and small hail this afternoon. Highs in the lower 50s. North Winds around 10 Mph with Gusts up to 20 Mph this afternoon. Chance of rain 60 percent.
Tonight 16 Sep Yellowstone National Park
Partly cloudy. Scattered rain Showers with isolated Thunderstorms in the evening. Areas of fog after midnight. Some Thunderstorms may produce gusty Winds and small hail in the evening. Lows in the mid 30s. Northeast Winds around 10 Mph. Chance of rain 30 percent.
Sylvan Lake Temperature Statistics
September Temperature
Yellowstone Lake (13 miles)
Lowest 6 September, 2025
30.9 °FAverage September
50.8 °FHighest 3 September, 2025
75.9 °F
Climate (2020–Present)
Yellowstone Lake (13 miles)
Average Low 2020–2025
22.3 °FAverage 2020–2025
35.2 °FAverage High 2020–2025
48 °F