Longview Weather Forecast

    • 55
    • 79

    Sunny

    • 55
    • 83

    Increasing Clouds

    • 52
    • 74

    Partly Sunny

    • 53
    • 76

    Partly Sunny

    • 54
    • 77

    Partly Sunny

    • 54
    • 74

    Partly Sunny

    • 53
    • 72

    Partly Sunny

Today 16 Sep Cowlitz County Lowlands

Mostly sunny. Highs in the lower 70s.

Tonight 16 Sep Cowlitz County Lowlands

Clear. Lows in the lower 50s. North wind 5 to 10 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Longview Temperature Statistics

September Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    60.9 °F

  • Highest 9 September, 2026

    86 °F

Climate (2021–2026)

Southwest Washington Regional Airport (2.5 miles)

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  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.4 °F
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