Sleepy Valley Weather Forecast

    • 55
    • 74

    Gradual Clearing

    • 56
    • 75

    Mostly Sunny

    • 58
    • 79

    Sunny

    • 61
    • 87

    Mostly Sunny

    • 59
    • 84

    Mostly Sunny

    • 58
    • 82

    Mostly Sunny

Today 16 Sep Western San Gabriel Mountains and Highway 14 Corridor

Areas of low Clouds and fog with drizzle in the morning then sunny. Highs from the mid 70s to lower 80s at low Elevations to the 60s at high Elevations. Southwest Winds 15 to 25 Mph.

Tonight 16 Sep Western San Gabriel Mountains and Highway 14 Corridor

Partly cloudy. Lows in the lower to mid 50s. Southwest Winds 15 to 25 Mph.

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Sleepy Valley Temperature Statistics

September Temperature

Los Angeles, Whiteman Airport (18 miles)

  • Lowest 1 September, 2026

    64.4 °F

  • Average September

    81.4 °F

  • Highest 9 September, 2026

    104 °F

Climate (2021–2026)

Los Angeles, Whiteman Airport (18 miles)

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  • Average Low 2021–2026

    60.5 °F

  • Average 2021–2026

    70.4 °F

  • Average High 2021–2026

    76.5 °F
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