Lake Riverside Weather Forecast

    • 58
    • 88

    Chance Rain Showers

    • 58
    • 87

    Mostly Sunny

    • 59
    • 87

    Partly Sunny

    • 52
    • 80

    Partly Sunny

    • 50
    • 77

    Mostly Sunny

    • 53
    • 82

    Mostly Sunny

Today 24 Sep Riverside County Mountains

Sunny in the Morning, then partly cloudy with a chance of Showers with isolated Thunderstorms in the afternoon. Highs 78 to 88. Areas of Winds southeast 10 Mph. Chance of measurable precipitation 30 percent.

Tonight 24 Sep Riverside County Mountains

Mostly clear. Lows 53 to 63. Light Winds.

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Lake Riverside Temperature Statistics

September Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 19 September, 2026

    32.7 °F

  • Average September

    60.7 °F

  • Highest 10 September, 2026

    81.3 °F

Climate (2021–2026)

Big Bear City Airport (51.6 miles)

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  • Average Low 2021–2026

    33.8 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
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