Whitman Mission National Historic Site Weather Forecast

    • 50
    • 80

    Sunny

    • 51
    • 81

    Mostly Sunny

    • 53
    • 83

    Mostly Sunny

    • 54
    • 85

    Mostly Sunny

    • 52
    • 81

    Partly Sunny

    • 50
    • 77

    Partly Sunny

    • 52
    • 80

    Partly Sunny

Today 18 Sep Foothills of the Blue Mountains of Washington

Partly cloudy. Highs in the 70s.

Tonight 18 Sep Foothills of the Blue Mountains of Washington

Mostly clear. Lows in the lower 50s. Light wind.

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Whitman Mission National Historic Site Temperature Statistics

September Temperature

Walla Walla Regional Airport (9.3 miles)

  • Lowest 15 September, 2026

    48.7 °F

  • Average September

    64 °F

  • Highest 9 September, 2026

    86.6 °F

Climate (2021–2026)

Walla Walla Regional Airport (9.3 miles)

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  • Average Low 2021–2026

    45.3 °F

  • Average 2021–2026

    54.8 °F

  • Average High 2021–2026

    64.5 °F
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