Kennewick Weather Forecast

    • 57
    • 78

    Increasing Clouds

    • 56
    • 81

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 58
    • 84

    Sunny

    • 58
    • 86

    Mostly Sunny

    • 55
    • 81

    Partly Sunny

Today 17 Sep Lower Columbia Basin of Washington

Sunny in the Morning, becoming partly cloudy. Highs in the mid to upper 70s. Light Wind, becoming north 5 to 10 Mph in the afternoon.

Tonight 17 Sep Lower Columbia Basin of Washington

Mostly cloudy. A 20 percent chance of rain Showers in the evening. Lows in the lower to mid 50s. South wind 5 to 10 Mph.

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Kennewick Temperature Statistics

September Temperature

Tri-Cities Airport (3.7 miles)

  • Lowest 8 September, 2026

    44.7 °F

  • Average September

    64.7 °F

  • Highest 10 September, 2026

    90.6 °F

Climate (2021–2026)

Tri-Cities Airport (3.7 miles)

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  • Average Low 2021–2026

    42.8 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    67.9 °F
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