Walter Lake Weather Forecast

    • 60
    • 86

    Slight Chance Rain Showers

    • 60
    • 91

    Mostly Sunny

    • 60
    • 95

    Partly Sunny

    • 59
    • 89

    Partly Sunny

    • 59
    • 90

    Mostly Sunny

    • 62
    • 95

    Mostly Sunny

Today 28 Aug Upper Columbia Basin

Mostly cloudy in the Morning, becoming partly cloudy. A 20 percent chance of Showers. Highs in the 80s. Southwest wind 5 to 10 Mph.

Tonight 28 Aug Upper Columbia Basin

Mostly clear. Lows in the upper 50s to mid 60s. Northeast wind 5 to 10 Mph.

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Walter Lake Temperature Statistics

August Temperature

Grant County Airport (30.4 miles)

  • Lowest 21 August, 2025

    51.7 °F

  • Average August

    74.6 °F

  • Highest 11 August, 2025

    101.6 °F

Climate (2020–Present)

Grant County Airport (30.4 miles)

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  • Average Low 2020–2025

    40.9 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    64.2 °F
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