Mattawa Weather Forecast

    • 38
    • 53

    Increasing Clouds

    • 42
    • 51

    Mostly Cloudy

    • 41
    • 61

    Rain Likely

    • 41
    • 57

    Rain

    • 35
    • 51

    Chance Rain

    • 33
    • 45

    Rain Likely

    • 32
    • 48

    Chance Rain

Today 13 Dec Moses Lake Area

Mostly cloudy in the morning then clearing. Patchy fog in the morning. Highs in the upper 40s to mid 50s. Southeast wind 5 to 10 Mph.

Tonight 13 Dec Moses Lake Area

Mostly cloudy. Lows in the lower to mid 30s. East wind 5 to 10 Mph.

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Mattawa Temperature Statistics

December Temperature

Sunnyside Municipal Airport (28.6 miles)

  • Lowest 10 December, 2025

    40.6 °F

  • Average December

    56.5 °F

  • Highest 10 December, 2025

    68 °F

Climate (2020–Present)

Sunnyside Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    38.9 °F

  • Average 2020–2025

    51.4 °F

  • Average High 2020–2025

    63.5 °F
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