Lake Riverside Weather Forecast

    • 65
    • 94

    Mostly Sunny

    • 66
    • 96

    Mostly Sunny

    • 64
    • 94

    Mostly Sunny

    • 65
    • 94

    Mostly Sunny

    • 66
    • 96

    Mostly Sunny

    • 66
    • 97

    Hot

Today 21 Aug Riverside County Mountains

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs 87 to 97. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 21 Aug Riverside County Mountains

Partly cloudy in the evening. Becoming clear. Lows 61 to 71. Areas of Winds west 10 to 15 Mph. Gusts to 25 Mph in the evening.

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Lake Riverside Temperature Statistics

August Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 15 August, 2026

    45.9 °F

  • Average August

    69.2 °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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