Lake Riverside Weather Forecast

    • 45
    • 69

    Partly Sunny

    • 44
    • 70

    Partly Sunny

    • 46
    • 70

    Mostly Cloudy

    • 44
    • 63

    Rain

    • 46
    • 56

    Rain

    • 42
    • 56

    Rain Showers

    • 39
    • 54

    Chance Rain Showers

Today 20 Dec Riverside County Mountains

Partly cloudy. Highs 64 to 74. Areas of Winds west 10 to 15 Mph. Gusts to 30 Mph this morning.

Tonight 20 Dec Riverside County Mountains

Partly cloudy. Lows 42 to 52. Areas of Winds west 10 to 15 Mph. Gusts to 30 Mph overnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Riverside Temperature Statistics

December Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 2 December, 2025

    19.4 °F

  • Average December

    41.9 °F

  • Highest 18 December, 2025

    66.2 °F

Climate (2020–Present)

Big Bear City Airport (51.6 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    60 °F
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