Lake Arrowhead Weather Forecast

    • 74
    • 95

    Becoming Sunny

    • 72
    • 95

    Sunny

    • 72
    • 96

    Slight Chance Thunderstorms

    • 71
    • 94

    Chance Thunderstorms

    • 71
    • 94

    Chance Thunderstorms

    • 71
    • 94

    Slight Chance Thunderstorms

    • 71
    • 93

    Slight Chance Thunderstorms

Today 8 Sep Union

Sunny with a 20 percent chance of Showers. Highs in the mid 90s. Temperature falling to around 90. Southeast Winds 5 to 10 Mph. Heat index Values up to 106.

Tonight 8 Sep Union

Mostly clear. Lows in the lower 70s. Southeast Winds 5 to 10 Mph.

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Lake Arrowhead Temperature Statistics

September Temperature

Oxford, University-Oxford Airport (24.2 miles)

  • Lowest 2 September, 2026

    71.6 °F

  • Average September

    84.4 °F

  • Highest 4 September, 2026

    100.4 °F

Climate (2021–2026)

Oxford, University-Oxford Airport (24.2 miles)

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  • Average Low 2021–2026

    52.6 °F

  • Average 2021–2026

    62.6 °F

  • Average High 2021–2026

    74 °F
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