Altadena Weather Forecast

    • 54
    • 74

    Mostly Sunny

    • 53
    • 70

    Partly Sunny

    • 54
    • 70

    Mostly Cloudy

    • 52
    • 71

    Mostly Cloudy

    • 54
    • 66

    Rain Showers

    • 53
    • 61

    Rain Showers

Today 19 Dec Los Angeles County San Gabriel Valley

Sunny. Highs in the lower to mid 70s.

Tonight 19 Dec Los Angeles County San Gabriel Valley

Mostly clear in the evening then Areas of low Clouds and fog. Lows in the lower 50s.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Altadena Temperature Statistics

December Temperature

El Monte (8.7 miles)

  • Lowest 6 December, 2025

    46.4 °F

  • Average December

    68 °F

  • Highest 9 December, 2025

    84.2 °F

Climate (2020–Present)

El Monte (8.7 miles)

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  • Average Low 2020–2025

    59.4 °F

  • Average 2020–2025

    70.2 °F

  • Average High 2020–2025

    76.9 °F
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