Bostonia Weather Forecast

    • 67
    • 89

    Becoming Sunny

    • 69
    • 94

    Mostly Sunny

    • 67
    • 89

    Chance Rain Showers

    • 67
    • 90

    Chance Rain Showers

    • 67
    • 87

    Slight Chance Thunderstorms

    • 66
    • 89

    Slight Chance Thunderstorms

    • 67
    • 90

    Mostly Sunny

Today 15 Sep San Diego County Inland Valleys

Mostly sunny. Warmer. Highs 82 to 87 in the western Valleys to 88 to 93 near the Foothills. Areas of Winds west to 10 Mph.

Tonight 15 Sep San Diego County Inland Valleys

Mostly clear. Lows 64 to 69. Light Winds.

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Bostonia Temperature Statistics

September Temperature

Gillespie Field Airport (1.2 miles)

  • Lowest 6 September, 2025

    62.6 °F

  • Average September

    71.8 °F

  • Highest 7 September, 2025

    95 °F

Climate (2020–Present)

Gillespie Field Airport (1.2 miles)

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  • Average Low 2020–2025

    52.9 °F

  • Average 2020–2025

    60.2 °F

  • Average High 2020–2025

    76 °F
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