Lower Monumental State Airport Weather Forecast

    • 51
    • 75

    Mostly Cloudy

    • 50
    • 74

    Slight Chance Rain Showers

    • 52
    • 77

    Mostly Sunny

    • 56
    • 85

    Mostly Sunny

    • 55
    • 86

    Mostly Sunny

    • 52
    • 77

    Partly Sunny

Today 6 Sep Lower Columbia Basin of Washington

Mostly cloudy with a 50 percent chance of rain Showers. Highs in the lower to mid 70s. Northwest wind 5 to 10 Mph with Gusts to around 20 Mph.

Tonight 6 Sep Lower Columbia Basin of Washington

Mostly cloudy. A 20 percent chance of rain Showers overnight. Lows in the upper 40s to lower 50s. Southwest wind 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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  • Temperature Real-Time

Lower Monumental State Airport Temperature Statistics

September Temperature

Walla Walla Regional Airport (33.6 miles)

  • Lowest 4 September, 2026

    48.9 °F

  • Average September

    65.2 °F

  • Highest 1 September, 2026

    81.6 °F

Climate (2021–2026)

Walla Walla Regional Airport (33.6 miles)

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  • Average Low 2021–2026

    45.4 °F

  • Average 2021–2026

    54.9 °F

  • Average High 2021–2026

    64.5 °F
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