Lake Riverside Weather Forecast

    • 45
    • 73

    Mostly Sunny

    • 46
    • 69

    Partly Sunny

    • 44
    • 69

    Mostly Cloudy

    • 43
    • 69

    Mostly Sunny

    • 44
    • 65

    Rain Showers Likely

    • 44
    • 56

    Rain Showers

Today 19 Dec Riverside County Mountains

Sunny this morning. Becoming partly cloudy. Highs 67 to 77. Areas of Winds west 10 to 15 Mph with Gusts to 30 Mph.

Tonight 19 Dec Riverside County Mountains

Partly cloudy. Lows 43 to 53. Areas of Winds west 10 to 20 Mph with Gusts to 35 Mph.

Graph Plots Open in Graphs

  • 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

    41.2 °F

  • Highest 9 December, 2025

    64.4 °F

Climate (2020–Present)

Big Bear City Airport (51.6 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    49 °F

  • Average High 2020–2025

    60 °F
Get WillyWeather+ to remove ads