Rainbow Weather Forecast

    • 66
    • 84

    Rain Showers Likely

    • 62
    • 82

    Slight Chance Thunderstorms

    • 63
    • 84

    Mostly Sunny

    • 66
    • 87

    Partly Sunny

    • 67
    • 89

    Partly Sunny

    • 66
    • 89

    Mostly Sunny

Today 18 Sep San Diego County Inland Valleys

Partly cloudy with a chance of Showers and a slight chance of Thunderstorms. Highs 83 to 88. Areas of Winds south to 10 Mph. Chance of measurable precipitation 50 percent.

Tonight 18 Sep San Diego County Inland Valleys

Partly cloudy with a slight chance of Showers and Thunderstorms. Lows 62 to 67. Areas of Winds southwest to 10 Mph in the evening becoming light. Chance of measurable precipitation 20 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rainbow Temperature Statistics

September Temperature

Fallbrook Community Airpark (6.8 miles)

  • Lowest 11 September, 2025

    59 °F

  • Average September

    70.6 °F

  • Highest 2 September, 2025

    96.8 °F

Climate (2020–Present)

Fallbrook Community Airpark (6.8 miles)

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  • Average Low 2020–2025

    53.4 °F

  • Average 2020–2025

    61.8 °F

  • Average High 2020–2025

    74.3 °F
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