Lake Riverside Weather Forecast

    • 65
    • 93

    Decreasing Clouds

    • 66
    • 95

    Mostly Sunny

    • 66
    • 96

    Slight Chance Thunderstorms

    • 64
    • 93

    Partly Sunny

    • 63
    • 92

    Mostly Sunny

    • 62
    • 91

    Mostly Sunny

Today 18 Aug Riverside County Mountains

Partly cloudy. Highs 87 to 97. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph this afternoon.

Tonight 18 Aug Riverside County Mountains

Partly cloudy in the evening. Becoming mostly clear. Lows 60 to 70. Areas of Winds west 10 to 15 Mph becoming north overnight.

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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

    69.4 °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

    33.7 °F

  • Average 2021–2026

    48.9 °F

  • Average High 2021–2026

    60.3 °F
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