Mattawa Weather Forecast

    • 25
    • 38

    Mostly Sunny

    • 26
    • 37

    Mostly Cloudy

    • 29
    • 35

    Mostly Cloudy

    • 32
    • 39

    Chance Rain/Snow

    • 32
    • 45

    Slight Chance Rain/Snow

    • 31
    • 43

    Chance Rain

Today 30 Dec Moses Lake Area

Mostly sunny. Highs in the mid to upper 30s. Northeast wind 5 to 10 Mph.

Tonight 30 Dec Moses Lake Area

Partly cloudy. Lows in the lower to mid 20s. Northeast wind 5 to 10 Mph.

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Mattawa Temperature Statistics

December Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 28 December, 2025

    22.5 °F

  • Average December

    43.5 °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

    39 °F

  • Average 2020–2025

    51.5 °F

  • Average High 2020–2025

    63.6 °F
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