Rainbow Bay Weather Forecast

    • 64
    • 79

    Mostly Sunny

    • 60
    • 77

    Rain Showers Likely

    • 58
    • 66

    Rain Showers Likely

    • 57
    • 65

    Chance Thunderstorms

    • 60
    • 69

    Slight Chance Thunderstorms

    • 62
    • 72

    Slight Chance Thunderstorms

    • 62
    • 72

    Mostly Sunny

Today 16 Sep San Bernardino County Mountains

Sunny this morning. Becoming partly cloudy. Highs 69 to 79 above 6000 feet to 80 to 89 below 6000 feet. Areas of Winds south 10 to 15 Mph. Gusts to 25 Mph this afternoon.

Tonight 16 Sep San Bernardino County Mountains

Partly cloudy. Lows 47 to 57 above 6000 feet to 58 to 68 below 6000 feet. Areas of Winds south 10 Mph becoming west overnight. Near ridge Tops and along desert Slopes, Areas of Winds south to 10 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainbow Bay Temperature Statistics

September Temperature

San Bernardino Intl. Airport (11.2 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 (11.2 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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