Crestline Weather Forecast

    • 71
    • 84

    Mostly Sunny

    • 70
    • 84

    Mostly Sunny

    • 70
    • 83

    Mostly Sunny

    • 70
    • 83

    Mostly Sunny

    • 72
    • 85

    Mostly Sunny

    • 72
    • 86

    Mostly Sunny

Today 21 Aug San Bernardino County Mountains

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs 77 to 87 above 6000 feet to 86 to 95 below 6000 feet. Areas of Winds south 10 to 15 Mph. Gusts to 30 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 21 Aug San Bernardino County Mountains

Partly cloudy in the evening. Becoming mostly clear. Cooler. Lows 53 to 63 above 6000 feet to 62 to 72 below 6000 feet. Areas of Winds southwest 10 to 15 Mph. Gusts to 30 Mph in the evening.

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Crestline Temperature Statistics

August Temperature

San Bernardino Intl. Airport (10.6 miles)

  • Lowest 15 August, 2026

    63.9 °F

  • Average August

    79 °F

  • Highest 19 August, 2026

    105.8 °F

Climate (2021–2026)

San Bernardino Intl. Airport (10.6 miles)

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  • Average Low 2021–2026

    54.2 °F

  • Average 2021–2026

    63.2 °F

  • Average High 2021–2026

    80.3 °F
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