Lake Mathews Weather Forecast

    • 68
    • 89

    Rain Showers Likely

    • 67
    • 81

    Rain Showers Likely

    • 67
    • 89

    Mostly Sunny

    • 69
    • 91

    Mostly Sunny

    • 70
    • 93

    Mostly Sunny

    • 68
    • 93

    Mostly Sunny

Today 5 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Highs 88 to 93. Areas of Winds south to 10 Mph becoming southwest with Gusts to 25 Mph this afternoon.

Tonight 5 Sep San Bernardino and Riverside County Valleys-The Inland Empire

Mostly clear in the Evening, then mostly cloudy with a slight chance of Showers overnight. Lows 63 to 68. Areas of Winds south to 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lake Mathews Temperature Statistics

September Temperature

Riverside Municipal Airport (7.5 miles)

  • Lowest 2 September, 2026

    60.7 °F

  • Average September

    74.4 °F

  • Highest 1 September, 2026

    91.7 °F

Climate (2021–2026)

Riverside Municipal Airport (7.5 miles)

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  • Average Low 2021–2026

    54.9 °F

  • Average 2021–2026

    67.3 °F

  • Average High 2021–2026

    80.4 °F
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