Sweetwater Weather Forecast

    • 59
    • 89

    Increasing Clouds

    • 60
    • 81

    Chance Rain Showers

    • 53
    • 78

    Chance Thunderstorms

    • 55
    • 84

    Mostly Sunny

    • 59
    • 90

    Partly Sunny

    • 62
    • 93

    Mostly Sunny

Today 5 Aug Lewiston Area

Mostly cloudy in the morning then clearing. Highs in the lower 80s to lower 90s.

Tonight 5 Aug Lewiston Area

Partly cloudy. Lows in the upper 50s to lower 60s.

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  • Temperature Real-Time

Sweetwater Temperature Statistics

August Temperature

Lewiston, Lewiston-Nez Perce County Airport (10.6 miles)

  • Lowest 3 August, 2025

    61 °F

  • Average August

    78.1 °F

  • Highest 2 August, 2025

    93.9 °F

Climate (2020–Present)

Lewiston, Lewiston-Nez Perce County Airport (10.6 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    55.4 °F

  • Average High 2020–2025

    65.8 °F
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