Big Roaring River Lake Weather Forecast
- 45
- 66
Chance Thunderstorms
- 48
- 72
Mostly Sunny
- 48
- 76
Mostly Sunny
- 45
- 73
Sunny
- 46
- 73
Sunny
- 49
- 75
Mostly Sunny
Today 17 Aug Boise Mountains
Partly cloudy with a chance of rain Showers. A chance of Thunderstorms in the afternoon. Thunderstorms may produce heavy rainfall and gusty Winds in the afternoon. Chance of rain 30 percent. Highs 74 to 88.
Tonight 17 Aug Boise Mountains
Partly cloudy with a slight chance of rain Showers and Thunderstorms in the Evening, then mostly clear after midnight. Thunderstorms may produce heavy rainfall and gusty Winds in the evening. Chance of rain 20 percent. Lows 45 to 60.
Big Roaring River Lake Temperature Statistics
August Temperature
Boise Air Terminal (39.8 miles)
Lowest 8 August, 2025
51.7 °FAverage August
77.3 °FHighest 12 August, 2025
102.7 °F
Climate (2020–Present)
Boise Air Terminal (39.8 miles)
Average Low 2020–2025
43.7 °FAverage 2020–2025
54.5 °FAverage High 2020–2025
65.8 °F