Lake Riverside Weather Forecast

    • 53
    • 79

    Decreasing Clouds

    • 47
    • 75

    Mostly Sunny

    • 52
    • 80

    Mostly Sunny

    • 55
    • 85

    Sunny

    • 57
    • 88

    Sunny

    • 57
    • 88

    Sunny

Today 27 Sep Riverside County Mountains

Mostly cloudy this morning. Becoming partly cloudy. Highs 72 to 81. Areas of Winds southwest 10 to 15 Mph. Gusts to 25 Mph this afternoon.

Tonight 27 Sep Riverside County Mountains

Mostly cloudy in the evening. Becoming partly cloudy. Cooler. Lows 46 to 56. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Riverside Temperature Statistics

September Temperature

Big Bear City Airport (51.6 miles)

  • Lowest 19 September, 2026

    32.7 °F

  • Average September

    59.9 °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

    33.7 °F

  • Average 2021–2026

    48.8 °F

  • Average High 2021–2026

    60.4 °F
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