Mount Wilson Weather Forecast

    • 64
    • 79

    Increasing Clouds

    • 62
    • 74

    Mostly Cloudy

    • 55
    • 72

    Mostly Sunny

    • 54
    • 67

    Mostly Sunny

    • 60
    • 69

    Sunny

    • 62
    • 72

    Mostly Sunny

    • 62
    • 72

    Mostly Sunny

Today 25 Sep Eastern San Gabriel Mountains

Sunny. Highs from the mid 70s to mid 80s at low Elevations to the mid 60s to lower 70s at high Elevations.

Tonight 25 Sep Eastern San Gabriel Mountains

Mostly clear in the evening then partly cloudy. Lows in the 60s to around 70 except the mid 40s to around 50 Colder Valleys and Slopes. Southwest Winds around 15 Mph.

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Mount Wilson Temperature Statistics

September Temperature

El Monte (9.9 miles)

  • Lowest 2 September, 2026

    64.4 °F

  • Average September

    80.5 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

El Monte (9.9 miles)

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  • Average Low 2021–2026

    60 °F

  • Average 2021–2026

    70.7 °F

  • Average High 2021–2026

    77.3 °F
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