West Side Highway Weather Forecast

    • 50
    • 71

    Slight Chance Thunderstorms

    • 51
    • 71

    Chance Rain Showers

    • 53
    • 72

    Mostly Cloudy

    • 52
    • 71

    Mostly Cloudy

    • 54
    • 74

    Partly Sunny

    • 57
    • 81

    Mostly Sunny

    • 56
    • 77

    Chance Rain

Today 4 Sep Cowlitz County Lowlands

Mostly sunny with a 20 percent chance of Thunderstorms. Highs in the lower 70s. Winds light.

Tonight 4 Sep Cowlitz County Lowlands

Partly cloudy this Evening, then becoming mostly cloudy. Patchy fog after midnight. Lows in the lower 50s. Light and variable Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

West Side Highway Temperature Statistics

September Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 1 September, 2026

    57 °F

  • Average September

    61.1 °F

  • Highest 1 September, 2026

    66 °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

    62.5 °F
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