Mattawa Weather Forecast

    • 32
    • 48

    Increasing Clouds

    • 31
    • 41

    Chance Rain

    • 30
    • 44

    Partly Sunny

    • 32
    • 43

    Chance Rain/Snow

    • 29
    • 42

    Chance Rain/Snow

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    Chance Rain/Snow

Today 20 Dec Moses Lake Area

Mostly sunny. Highs in the lower to mid 40s. Windy. Southwest wind 15 to 25 Mph with Gusts up to 35 Mph.

Tonight 20 Dec Moses Lake Area

Mostly cloudy. Lows in the upper 20s to lower 30s. South wind 5 to 15 Mph. Gusts up to 30 Mph in the evening.

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Mattawa Temperature Statistics

December Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 14 December, 2025

    30.6 °F

  • Average December

    50 °F

  • Highest 15 December, 2025

    69.1 °F

Climate (2020–Present)

Sunnyside Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    38.9 °F

  • Average 2020–2025

    51.5 °F

  • Average High 2020–2025

    63.6 °F
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