Rialto Weather Forecast

    • 69
    • 98

    Hot

    • 67
    • 94

    Slight Chance Thunderstorms

    • 65
    • 90

    Mostly Sunny

    • 62
    • 87

    Partly Sunny

    • 62
    • 88

    Mostly Sunny

    • 64
    • 90

    Mostly Sunny

Today 10 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs 93 to 100. Areas of Winds west to 10 Mph. Becoming 10 to 15 Mph with Gusts to 25 Mph this afternoon. Chance of measurable precipitation 20 percent.

Tonight 10 Aug San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy in the evening. Becoming mostly clear. Lows 63 to 68. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph in the evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rialto Temperature Statistics

August Temperature

San Bernardino Intl. Airport (6.8 miles)

  • Lowest 5 August, 2026

    66.7 °F

  • Average August

    80.1 °F

  • Highest 1 August, 2026

    104 °F

Climate (2021–2026)

San Bernardino Intl. Airport (6.8 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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