Prosser Airport Weather Forecast

    • 50
    • 75

    Increasing Clouds

    • 47
    • 75

    Rain Showers

    • 45
    • 67

    Rain Showers

    • 46
    • 70

    Mostly Sunny

    • 48
    • 73

    Mostly Sunny

    • 50
    • 76

    Sunny

Today 11 Sep Lower Columbia Basin of Washington

Partly cloudy in the morning then clearing. Highs in the 70s. Southwest wind 5 to 10 Mph.

Tonight 11 Sep Lower Columbia Basin of Washington

Mostly cloudy. Lows in the lower to mid 50s. Light wind.

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Prosser Airport Temperature Statistics

September Temperature

Sunnyside Municipal Airport (11.2 miles)

  • Lowest 9 September, 2026

    44.2 °F

  • Average September

    60.7 °F

  • Highest 1 September, 2026

    85.5 °F

Climate (2021–2026)

Sunnyside Municipal Airport (11.2 miles)

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  • Average Low 2021–2026

    38.8 °F

  • Average 2021–2026

    51 °F

  • Average High 2021–2026

    63 °F
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