Kelso-Longview Airport Weather Forecast

    • 56
    • 89

    Sunny

    • 56
    • 78

    Mostly Sunny

    • 54
    • 75

    Partly Sunny

    • 54
    • 77

    Partly Sunny

    • 58
    • 71

    Chance Rain

    • 54
    • 71

    Chance Rain

Today 16 Sep Cowlitz County Lowlands

Sunny. Highs in the upper 80s. East wind 5 to 10 Mph, becoming southeast this afternoon.

Tonight 16 Sep Cowlitz County Lowlands

Clear. Lows in the mid 50s. South wind 5 to 10 Mph, becoming light after midnight.

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Kelso-Longview Airport Temperature Statistics

September Temperature

Southwest Washington Regional Airport (0 miles)

  • Lowest 14 September, 2025

    51.1 °F

  • Average September

    65.6 °F

  • Highest 2 September, 2025

    88 °F

Climate (2020–Present)

Southwest Washington Regional Airport (0 miles)

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  • Average Low 2020–2025

    45.1 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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