Lake Riverside Weather Forecast

    • 53
    • 85

    Mostly Sunny

    • 50
    • 82

    Mostly Sunny

    • 50
    • 79

    Mostly Sunny

    • 50
    • 80

    Sunny

    • 51
    • 82

    Sunny

    • 52
    • 84

    Mostly Sunny

    • 52
    • 83

    Mostly Sunny

Today 14 Sep Riverside County Mountains

Sunny. Highs 79 to 89. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph.

Tonight 14 Sep Riverside County Mountains

Mostly clear. Cooler. Lows 50 to 60. Areas of Winds west to 10 Mph this evening becoming light.

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  • 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

    61.8 °F

  • Highest 10 September, 2026

    81.3 °F

Climate (2021–2026)

Big Bear City Airport (51.6 miles)

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  • Average Low 2021–2026

    33.8 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
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