Lake Riverside Weather Forecast

    • 59
    • 86

    Increasing Clouds

    • 59
    • 89

    Mostly Sunny

    • 61
    • 91

    Mostly Sunny

    • 62
    • 92

    Mostly Sunny

    • 64
    • 95

    Mostly Sunny

    • 63
    • 95

    Mostly Sunny

Today 15 Aug Riverside County Mountains

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs 78 to 88. Areas of Winds southeast to 10 Mph becoming west 10 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 15 Aug Riverside County Mountains

Partly cloudy. Lows 55 to 65. Areas of Winds northwest to 10 Mph.

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Lake Riverside Temperature Statistics

August Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 12 August, 2026

    50.2 °F

  • Average August

    70.2 °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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