Lake Riverside Weather Forecast

    • 60
    • 85

    Chance Rain Showers

    • 56
    • 77

    Rain Showers Likely

    • 56
    • 77

    Chance Rain Showers

    • 58
    • 81

    Chance Rain Showers

    • 60
    • 83

    Slight Chance Thunderstorms

    • 60
    • 84

    Slight Chance Thunderstorms

Today 17 Sep Riverside County Mountains

Partly cloudy. A slight chance of Showers and Thunderstorms in the afternoon. Highs 77 to 87. Areas of Winds east to 10 Mph. Chance of measurable precipitation 20 percent.

Tonight 17 Sep Riverside County Mountains

Mostly cloudy with a slight chance of Thunderstorms. A slight chance of Showers in the Evening, then a chance of Showers overnight. Lows 52 to 62. Light Winds. Chance of measurable precipitation 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Riverside Temperature Statistics

September Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 12 September, 2025

    32 °F

  • Average September

    57.5 °F

  • Highest 1 September, 2025

    78.8 °F

Climate (2020–Present)

Big Bear City Airport (51.6 miles)

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  • Average Low 2020–2025

    34.1 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    60.1 °F
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