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.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Big Rainbow Lake Temperature Statistics

July Temperature

Boise Air Terminal (41 miles)

  • Lowest 5 July, 2025

    54.6 °F
  • Average July

    79.1 °F
  • Highest 8 July, 2025

    104.6 °F

Climate (2020–Present)

Boise Air Terminal (41 miles)

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  • Average Low 2020–2025

    43.7 °F
  • Average 2020–2025

    54.5 °F
  • Average High 2020–2025

    65.8 °F
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