Grape Mountain Weather Forecast

    • 58
    • 79

    Chance Thunderstorms

    • 61
    • 86

    Mostly Sunny

    • 58
    • 89

    Sunny

    • 57
    • 86

    Sunny

    • 58
    • 87

    Sunny

    • 61
    • 89

    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.

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Grape Mountain Temperature Statistics

August Temperature

Boise Air Terminal (23.6 miles)

  • Lowest 8 August, 2025

    51.7 °F

  • Average August

    77.3 °F

  • Highest 12 August, 2025

    102.7 °F

Climate (2020–Present)

Boise Air Terminal (23.6 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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