San Carlos Weather Forecast

    • 64
    • 79

    Increasing Clouds

    • 65
    • 78

    Mostly Cloudy

    • 63
    • 76

    Partly Sunny

    • 63
    • 77

    Mostly Sunny

    • 64
    • 81

    Mostly Sunny

    • 66
    • 83

    Mostly Sunny

Today 19 Sep San Diego County Inland Valleys

Partly cloudy in the morning. Becoming mostly sunny. Highs 87 to 92.

Tonight 19 Sep San Diego County Inland Valleys

Mostly clear this evening. Becoming mostly cloudy. Lows 57 to 62. Areas of Winds west to 10 Mph this evening becoming light.

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San Carlos Temperature Statistics

September Temperature

Gillespie Field Airport (4.3 miles)

  • Lowest 3 September, 2026

    57.2 °F

  • Average September

    76.1 °F

  • Highest 9 September, 2026

    107.6 °F

Climate (2021–2026)

Gillespie Field Airport (4.3 miles)

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  • Average Low 2021–2026

    53.6 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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