Mattawa Weather Forecast

    • 55
    • 80

    Sunny

    • 56
    • 80

    Mostly Sunny

    • 57
    • 81

    Sunny

    • 56
    • 83

    Mostly Sunny

    • 54
    • 79

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 55
    • 76

    Partly Sunny

Today 18 Sep Moses Lake Area

Sunny. Highs in the upper 70s to lower 80s. Light wind.

Tonight 18 Sep Moses Lake Area

Mostly clear. Lows in the upper 40s to lower 50s. Light wind.

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Mattawa Temperature Statistics

September Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 14 September, 2026

    42.4 °F

  • Average September

    60.5 °F

  • Highest 1 September, 2026

    85.5 °F

Climate (2021–2026)

Sunnyside Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    63 °F
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