Mast Park Weather Forecast

    • 67
    • 90

    Decreasing Clouds

    • 70
    • 92

    Partly Sunny

    • 70
    • 92

    Slight Chance Thunderstorms

    • 69
    • 91

    Slight Chance Thunderstorms

    • 68
    • 91

    Slight Chance Thunderstorms

    • 66
    • 87

    Slight Chance Thunderstorms

Today 20 Aug San Diego County Inland Valleys

Mostly sunny. Highs 85 to 90 in the western Valleys to 93 to 98 near the Foothills. Areas of Winds west to 10 Mph becoming 10 to 15 Mph in the afternoon.

Tonight 20 Aug San Diego County Inland Valleys

Partly cloudy. Lows 64 to 69. Areas of Winds west to 10 Mph in the evening becoming light.

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Mast Park Temperature Statistics

August Temperature

Gillespie Field Airport (1.2 miles)

  • Lowest 3 August, 2025

    60.8 °F

  • Average August

    68.9 °F

  • Highest 7 August, 2025

    98.6 °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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