Big Rainbow Lake Weather Forecast

    • 9
    • 29

    Blizzard

    • 17
    • 21

    Snow

    • 24
    • 28

    Snow

    • 22
    • 26

    Snow

    • 25
    • 28

    Snow

    • 17
    • 29

    Snow

    • 18
    • 27

    Snow Likely

Today 19 Dec Boise Mountains

Rain and snow. Areas of fog this morning. Patchy fog this afternoon. Snow heavy at Times. Chance of precipitation near 100 percent. Little or no snow accumulation across the lower Elevations, with snow accumulation up to 10 Inches over the Mountains. Highs 34 to 47. Temperature falling into the upper 30s this afternoon. Breezy.

Tonight 19 Dec Boise Mountains

Snow this Evening, then partly cloudy after midnight. Areas of fog. Chance of snow 80 percent. New snow accumulation up to 1 inch. Much Colder with Lows 9 to 24.

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Big Rainbow Lake Temperature Statistics

December Temperature

Boise Air Terminal (41 miles)

  • Lowest 1 December, 2025

    21 °F

  • Average December

    41.3 °F

  • Highest 10 December, 2025

    62.1 °F

Climate (2020–Present)

Boise Air Terminal (41 miles)

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  • Average Low 2020–2025

    44 °F

  • Average 2020–2025

    54.7 °F

  • Average High 2020–2025

    65.9 °F
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