Mattawa Weather Forecast

    • 51
    • 72

    Mostly Sunny

    • 50
    • 73

    Chance Rain Showers

    • 54
    • 76

    Chance Rain Showers

    • 54
    • 79

    Slight Chance Rain Showers

    • 56
    • 80

    Partly Sunny

    • 59
    • 85

    Mostly Sunny

    • 58
    • 86

    Partly Sunny

Today 4 Sep Moses Lake Area

Partly cloudy. Highs in the mid 60s to lower 70s. South wind 5 to 10 Mph.

Tonight 4 Sep Moses Lake Area

Partly cloudy. Lows in the mid to upper 40s. Light Wind, becoming northeast 5 to 10 Mph overnight.

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Mattawa Temperature Statistics

September Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 2 September, 2026

    52 °F

  • Average September

    65.1 °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

    63.1 °F
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