Riverside Weather Forecast

    • 53
    • 78

    Mostly Sunny

    • 56
    • 83

    Mostly Sunny

    • 57
    • 87

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

    • 60
    • 88

    Partly Sunny

    • 58
    • 89

    Partly Sunny

Today 15 Sep Okanogan Valley

Partly cloudy in the morning then clearing. Highs in the 70s.

Tonight 15 Sep Okanogan Valley

Mostly clear. Lows in the lower to mid 50s.

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Riverside Temperature Statistics

September Temperature

Omak Airport (2.5 miles)

  • Lowest 12 September, 2025

    55 °F

  • Average September

    76.1 °F

  • Highest 3 September, 2025

    104 °F

Climate (2020–Present)

Omak Airport (2.5 miles)

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  • Average Low 2020–2025

    40.7 °F

  • Average 2020–2025

    51.7 °F

  • Average High 2020–2025

    62.7 °F
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