Lake Riverside Weather Forecast

    • 41
    • 65

    Sunny

    • 42
    • 70

    Sunny

    • 47
    • 70

    Sunny

    • 47
    • 75

    Sunny

    • 47
    • 76

    Sunny

    • 47
    • 73

    Sunny

Today 6 Dec Riverside County Mountains

Sunny, warmer. Highs 59 to 69. Areas of Winds west 10 Mph.

Tonight 6 Dec Riverside County Mountains

Clear. Lows 36 to 46. Light Winds becoming east to 10 Mph overnight.

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Lake Riverside Temperature Statistics

December Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 2 December, 2025

    19.4 °F

  • Average December

    31.9 °F

  • Highest 2 December, 2025

    53.6 °F

Climate (2020–Present)

Big Bear City Airport (51.6 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    48.9 °F

  • Average High 2020–2025

    59.9 °F
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