Prosser Weather Forecast

    • 56
    • 95

    Mostly Sunny

    • 56
    • 93

    Mostly Sunny

    • 60
    • 96

    Partly Sunny

    • 58
    • 95

    Partly Sunny

    • 52
    • 89

    Mostly Sunny

    • 54
    • 87

    Mostly Sunny

Today 18 Aug Lower Columbia Basin of Washington

Sunny. Highs in the lower to mid 90s. Southwest wind 5 to 10 Mph with Gusts to around 20 Mph.

Tonight 18 Aug Lower Columbia Basin of Washington

Mostly clear. Lows in the upper 50s to lower 60s. Southwest wind 5 to 10 Mph. Gusts up to 20 Mph in the evening.

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Prosser Temperature Statistics

August Temperature

Sunnyside Municipal Airport (12.4 miles)

  • Lowest 2 August, 2026

    44.8 °F

  • Average August

    72.5 °F

  • Highest 6 August, 2026

    97.2 °F

Climate (2021–2026)

Sunnyside Municipal Airport (12.4 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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