Lake Riverside Weather Forecast

    • 61
    • 90

    Sunny

    • 58
    • 88

    Mostly Sunny

    • 54
    • 84

    Sunny

    • 51
    • 83

    Sunny

    • 50
    • 80

    Sunny

    • 53
    • 81

    Mostly Sunny

Today 11 Sep Riverside County Mountains

Sunny. Highs 84 to 94. Areas of Winds west 10 to 20 Mph. Gusts to 25 Mph. Becoming 30 Mph this afternoon.

Tonight 11 Sep Riverside County Mountains

Clear, cooler. Lows 55 to 65. Areas of Winds west 10 to 20 Mph. Gusts to 35 Mph. Becoming 30 Mph overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Riverside Temperature Statistics

September Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 1 September, 2026

    41.2 °F

  • Average September

    60.2 °F

  • Highest 9 September, 2026

    76.8 °F

Climate (2021–2026)

Big Bear City Airport (51.6 miles)

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

  • Average Low 2021–2026

    33.8 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
Get WillyWeather+ to remove ads