Mattawa Weather Forecast

    • 56
    • 75

    Increasing Clouds

    • 54
    • 77

    Rain

    • 51
    • 66

    Rain

    • 50
    • 71

    Mostly Sunny

    • 52
    • 74

    Mostly Sunny

    • 53
    • 77

    Sunny

    • 55
    • 79

    Mostly Sunny

Today 11 Sep Moses Lake Area

Partly cloudy. Highs in the lower to mid 70s. Light wind.

Tonight 11 Sep Moses Lake Area

Mostly cloudy. Lows in the upper 40s to lower 50s. Light Wind, becoming northeast 5 to 10 Mph with Gusts up to 20 Mph overnight.

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Mattawa Temperature Statistics

September Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 9 September, 2026

    44.2 °F

  • Average September

    60.7 °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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