Mattawa Weather Forecast

    • 72
    • 98

    Hot

    • 60
    • 96

    Becoming Sunny

    • 59
    • 86

    Mostly Sunny

    • 63
    • 90

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

    • 58
    • 89

    Mostly Sunny

    • 57
    • 86

    Mostly Sunny

Today 21 Aug Moses Lake Area

Hot. Mostly cloudy. Highs 96 to 102. Northeast wind 5 to 10 Mph.

Tonight 21 Aug Moses Lake Area

Cloudy. Haze and patchy smoke. Lows in the upper 60s to lower 70s. North wind 5 to 10 Mph.

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Mattawa Temperature Statistics

August Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 2 August, 2026

    44.8 °F

  • Average August

    72.7 °F

  • Highest 6 August, 2026

    97.2 °F

Climate (2021–2026)

Sunnyside Municipal Airport (28.6 miles)

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  • Average Low 2021–2026

    38.7 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    63 °F
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