Lake Riverside Weather Forecast

    • 55
    • 84

    Increasing Clouds

    • 54
    • 79

    Mostly Cloudy

    • 54
    • 82

    Mostly Sunny

    • 57
    • 85

    Mostly Sunny

    • 59
    • 87

    Mostly Sunny

    • 59
    • 88

    Mostly Sunny

Today 12 Aug Riverside County Mountains

Partly cloudy. A slight chance of Showers and Thunderstorms this afternoon. Highs 78 to 88. Areas of Winds west to 10 Mph. Becoming 10 to 20 Mph with Gusts to 30 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 12 Aug Riverside County Mountains

Partly cloudy in the evening. Becoming mostly cloudy. Cooler. Lows 51 to 61. Areas of Winds west 10 to 20 Mph with Gusts to 30 Mph.

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Lake Riverside Temperature Statistics

August Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 8 August, 2026

    51.8 °F

  • Average August

    72.4 °F

  • Highest 1 August, 2026

    88 °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

    48.9 °F

  • Average High 2021–2026

    60.4 °F
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