West Side Highway Weather Forecast

    • 50
    • 77

    Decreasing Clouds

    • 51
    • 78

    Mostly Sunny

    • 51
    • 75

    Partly Sunny

    • 49
    • 71

    Partly Sunny

    • 51
    • 71

    Partly Sunny

    • 52
    • 73

    Slight Chance Rain

Today 19 Sep Cowlitz County Lowlands

Mostly cloudy in the Morning, then becoming partly sunny. Patchy fog in the morning. Highs in the upper 70s. Winds light.

Tonight 19 Sep Cowlitz County Lowlands

Mostly clear in the Evening, then becoming partly cloudy. Patchy fog after midnight. Lows in the lower 50s. Winds light.

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West Side Highway Temperature Statistics

September Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    61 °F

  • Highest 9 September, 2026

    86 °F

Climate (2021–2026)

Southwest Washington Regional Airport (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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