Mount Gleason Weather Forecast

    • 63
    • 67

    Rain Showers Likely

    • 60
    • 65

    Chance Rain Showers

    • 61
    • 70

    Mostly Sunny

    • 63
    • 70

    Mostly Sunny

    • 66
    • 73

    Partly Sunny

    • 62
    • 71

    Mostly Sunny

Today 18 Sep Western San Gabriel Mountains and Highway 14 Corridor

Showers with a slight chance of Thunderstorms in the Morning, then Showers likely with a slight chance of Thunderstorms in the afternoon. Some Thunderstorms may produce heavy rainfall. Highs from the mid 70s to around 80 at low Elevations to around 70 at high Elevations. Southeast Winds 15 to 25 Mph.

Tonight 18 Sep Western San Gabriel Mountains and Highway 14 Corridor

Mostly cloudy with a chance of Showers and a slight chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Lows in the mid 60s to around 70 except around 60 Colder Valleys and Slopes. South Winds 15 to 25 Mph.

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Mount Gleason Temperature Statistics

September Temperature

Los Angeles, Whiteman Airport (14.9 miles)

  • Lowest 11 September, 2025

    62.6 °F

  • Average September

    81.8 °F

  • Highest 2 September, 2025

    98.6 °F

Climate (2020–Present)

Los Angeles, Whiteman Airport (14.9 miles)

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  • Average Low 2020–2025

    60.1 °F

  • Average 2020–2025

    70 °F

  • Average High 2020–2025

    76.2 °F
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