Prosser Weather Forecast

    • 33
    • 45

    Chance Rain

    • 28
    • 48

    Chance Rain

    • 24
    • 43

    Partly Sunny

    • 23
    • 37

    Mostly Cloudy

    • 23
    • 36

    Partly Sunny

    • 24
    • 38

    Patchy Fog

Today 25 Dec Lower Columbia Basin of Washington

Partly sunny with a 50 percent chance of rain. Highs in the mid to upper 40s. North wind 5 to 10 Mph. Rainfall Amounts less than a tenth of an inch.

Tonight 25 Dec Lower Columbia Basin of Washington

Mostly cloudy with a 50 percent chance of rain. Lows in the lower to mid 30s. Southwest wind 5 to 10 Mph. Rainfall Amounts less than a tenth of an inch.

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Prosser Temperature Statistics

December Temperature

Sunnyside Municipal Airport (12.4 miles)

  • Lowest 22 December, 2025

    28 °F

  • Average December

    46.7 °F

  • Highest 15 December, 2025

    69.1 °F

Climate (2020–Present)

Sunnyside Municipal Airport (12.4 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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