New West Side Weather Forecast

    • 50
    • 68

    Gradual Clearing

    • 54
    • 66

    Rain

    • 49
    • 61

    Rain

    • 48
    • 64

    Mostly Cloudy

    • 48
    • 66

    Mostly Cloudy

    • 50
    • 66

    Chance Rain

Today 23 Sep Cowlitz County Lowlands

Mostly cloudy in the Morning, then becoming partly sunny. Patchy fog in the morning. Highs in the upper 60s. Light and variable Winds, becoming light in the afternoon.

Tonight 23 Sep Cowlitz County Lowlands

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the upper 40s. Winds light.

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New West Side Temperature Statistics

September Temperature

Southwest Washington Regional Airport (2.5 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    61.2 °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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