Crestline Weather Forecast

    • 60
    • 68

    Rain Showers Likely

    • 59
    • 67

    Chance Rain Showers

    • 61
    • 70

    Mostly Sunny

    • 65
    • 75

    Mostly Sunny

    • 67
    • 76

    Mostly Sunny

    • 63
    • 76

    Mostly Sunny

Today 18 Sep San Bernardino County Mountains

Showers. A slight chance of Thunderstorms this Morning, then a chance of Thunderstorms this afternoon. Highs 59 to 69 above 6000 feet to 68 to 76 below 6000 feet. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph.

Tonight 18 Sep San Bernardino County Mountains

Partly cloudy with a slight chance of Thunderstorms. Showers likely. Cooler. Lows 43 to 53 above 6000 feet to 52 to 61 below 6000 feet. Areas of Winds south 10 to 15 Mph with Gusts to 25 Mph. Chance of measurable precipitation 60 percent.

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Crestline Temperature Statistics

September Temperature

San Bernardino Intl. Airport (10.6 miles)

  • Lowest 9 September, 2025

    60.8 °F

  • Average September

    75.2 °F

  • Highest 1 September, 2025

    100.4 °F

Climate (2020–Present)

San Bernardino Intl. Airport (10.6 miles)

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  • Average Low 2020–2025

    54.1 °F

  • Average 2020–2025

    63.2 °F

  • Average High 2020–2025

    80.5 °F
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