Mattawa Weather Forecast

    • 45
    • 66

    Increasing Clouds

    • 46
    • 69

    Mostly Sunny

    • 51
    • 73

    Partly Sunny

    • 51
    • 73

    Partly Sunny

    • 49
    • 70

    Partly Sunny

    • 48
    • 69

    Partly Sunny

Today 26 Sep Moses Lake Area

Sunny. Highs in the lower to mid 60s. Southwest wind 5 to 10 Mph.

Tonight 26 Sep Moses Lake Area

Mostly cloudy. Lows in the upper 30s to lower 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 14 September, 2026

    42.4 °F

  • Average September

    61 °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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