Rancho Fontana Weather Forecast

    • 39
    • 54

    Chance Rain Showers

    • 38
    • 52

    Rain Showers

    • 40
    • 55

    Mostly Sunny

    • 47
    • 64

    Partly Sunny

    • 50
    • 69

    Mostly Sunny

    • 54
    • 72

    Mostly Cloudy

    • 55
    • 70

    Chance Rain Showers

Today 18 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Mostly cloudy with a chance of Showers this Morning, then partly cloudy this afternoon. Highs 49 to 56. Areas of Winds west 10 to 20 Mph. Gusts to 35 Mph. Becoming 30 Mph this afternoon. Chance of measurable precipitation 50 percent.

Tonight 18 Feb San Bernardino and Riverside County Valleys-The Inland Empire

Partly cloudy this evening. Becoming mostly cloudy. Patchy fog overnight. Lows 35 to 39. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph this evening becoming light.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Rancho Fontana Temperature Statistics

February Temperature

Ontario International Airport (7.5 miles)

  • Lowest 14 February, 2026

    46.9 °F

  • Average February

    61.5 °F

  • Highest 4 February, 2026

    87.7 °F

Climate (2021–Present)

Ontario International Airport (7.5 miles)

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  • Average Low 2021–2026

    55.6 °F

  • Average 2021–2026

    66.7 °F

  • Average High 2021–2026

    79.1 °F
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