Rancho Cucamonga Weather Forecast

    • 69
    • 98

    Hot

    • 68
    • 98

    Sunny

    • 68
    • 99

    Hot

    • 66
    • 99

    Hot

    • 63
    • 93

    Mostly Sunny

    • 61
    • 87

    Partly Sunny

Today 17 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Mostly sunny. Hot. Highs 93 to 100. Areas of Winds east 10 to 15 Mph with Gusts to 30 Mph becoming north with Gusts to 25 Mph this afternoon.

Tonight 17 Mar San Bernardino and Riverside County Valleys-The Inland Empire

Clear. Lows 59 to 62 in wind Sheltered Areas to 62 to 71 in warmer Locations. Areas of Winds west 10 to 15 Mph this evening becoming light.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Rancho Cucamonga Temperature Statistics

March Temperature

Ontario International Airport (3.7 miles)

  • Lowest 6 March, 2026

    51.1 °F

  • Average March

    67 °F

  • Highest 12 March, 2026

    91 °F

Climate (2021–Present)

Ontario International Airport (3.7 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    55.7 °F

  • Average 2021–2026

    66.9 °F

  • Average High 2021–2026

    79.2 °F
Get WillyWeather+ to remove ads