Big Rainbow Lake Weather Forecast
- 40
- 66
Rain Showers
- 41
- 60
Slight Chance Thunderstorms
- 40
- 62
Mostly Sunny
- 39
- 64
Mostly Sunny
- 35
- 57
Slight Chance Thunderstorms
- 40
- 59
Mostly Sunny
- 41
- 63
Mostly Sunny
Today 31 Jul Boise Mountains
Partly cloudy. Scattered Showers and Thunderstorms this afternoon. Thunderstorms may produce heavy rainfall and damaging Winds this afternoon. Chance of rain 30 percent. Highs 78 to 93.
Tonight 31 Jul Boise Mountains
Numerous rain Showers and scattered Thunderstorms this Evening, then partly cloudy with isolated rain Showers and Thunderstorms after midnight. Thunderstorms may produce heavy rainfall and damaging Winds this Evening, then Thunderstorms may produce gusty Winds after midnight. Chance of rain 60 percent. Lows 43 to 58.
Big Rainbow Lake Temperature Statistics
July Temperature
Boise Air Terminal (41 miles)
Lowest 5 July, 2025
54.6 °FAverage July
79.1 °FHighest 8 July, 2025
104.6 °F
Climate (2020–Present)
Boise Air Terminal (41 miles)
Average Low 2020–2025
43.7 °FAverage 2020–2025
54.5 °FAverage High 2020–2025
65.8 °F