Riverside County Park Weather Forecast

    • 51
    • 70

    Decreasing Clouds

    • 54
    • 78

    Mostly Sunny

    • 56
    • 85

    Mostly Sunny

    • 52
    • 75

    Partly Sunny

    • 51
    • 68

    Mostly Cloudy

    • 52
    • 70

    Slight Chance Rain

Today 7 Sep Cowlitz County Lowlands

Mostly cloudy this Morning, then becoming mostly sunny. Patchy fog this morning. Highs around 70. Winds light.

Tonight 7 Sep Cowlitz County Lowlands

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

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Riverside County Park Temperature Statistics

September Temperature

Southwest Washington Regional Airport (5 miles)

  • Lowest 4 September, 2026

    48 °F

  • Average September

    59.4 °F

  • Highest 5 September, 2026

    73.9 °F

Climate (2021–2026)

Southwest Washington Regional Airport (5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    45.2 °F

  • Average 2021–2026

    53.1 °F

  • Average High 2021–2026

    62.4 °F
Get WillyWeather+ to remove ads