Bostonia Weather Forecast

    • 71
    • 90

    Slight Chance Rain Showers

    • 71
    • 91

    Slight Chance Rain Showers

    • 70
    • 93

    Partly Sunny

    • 70
    • 93

    Partly Sunny

    • 70
    • 94

    Mostly Sunny

    • 68
    • 92

    Mostly Sunny

Today 5 Sep San Diego County Inland Valleys

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers this afternoon. Highs 86 to 91. Areas of Winds southwest to 10 Mph. Chance of measurable precipitation 20 percent.

Tonight 5 Sep San Diego County Inland Valleys

Partly cloudy in the Evening, then cloudy with a slight chance of Showers overnight. Lows 66 to 71. Light Winds. Chance of measurable precipitation 20 percent.

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Bostonia Temperature Statistics

September Temperature

Gillespie Field Airport (1.2 miles)

  • Lowest 1 September, 2026

    62.6 °F

  • Average September

    69.3 °F

  • Highest 1 September, 2026

    87.8 °F

Climate (2021–2026)

Gillespie Field Airport (1.2 miles)

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  • Average Low 2021–2026

    53.5 °F

  • Average 2021–2026

    60.6 °F

  • Average High 2021–2026

    76.3 °F
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