Walnut Canyon Reservoir Weather Forecast

    • 64
    • 89

    Mostly Sunny

    • 66
    • 91

    Mostly Sunny

    • 67
    • 89

    Partly Sunny

    • 67
    • 87

    Chance Rain Showers

    • 66
    • 87

    Chance Rain Showers

    • 63
    • 85

    Mostly Sunny

Today 15 Sep Orange County Inland

Partly cloudy with patchy fog in the morning. Becoming mostly sunny. Highs 81 to 85 towards the coast to 89 farther inland. Light Winds becoming southwest 10 Mph in the afternoon.

Tonight 15 Sep Orange County Inland

Mostly clear in the evening. Becoming partly cloudy overnight with patchy fog. Lows 63 to 67. Light Winds.

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Walnut Canyon Reservoir Temperature Statistics

September Temperature

Corona Airport (9.3 miles)

  • Lowest 12 September, 2025

    54 °F

  • Average September

    75.5 °F

  • Highest 2 September, 2025

    102.9 °F

Climate (2020–Present)

Corona Airport (9.3 miles)

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  • Average Low 2020–2025

    52.2 °F

  • Average 2020–2025

    65 °F

  • Average High 2020–2025

    78.1 °F
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