Upland Weather Forecast

    • 55
    • 79

    Decreasing Clouds

    • 58
    • 84

    Mostly Sunny

    • 59
    • 83

    Patchy Fog

    • 58
    • 83

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

    • 57
    • 82

    Mostly Sunny

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

Partly cloudy this morning. Becoming mostly sunny. Warmer. Highs 76 to 82. Areas of Winds north 10 to 20 Mph. Gusts to 40 Mph. Becoming 35 Mph this afternoon.

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

Partly cloudy in the evening. Becoming mostly clear. Patchy fog overnight. Lows around 50 in wind Sheltered Areas to 49 to 55 in warmer Locations. Areas of Winds west 10 to 15 Mph with Gusts to 25 Mph becoming north overnight.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Upland Temperature Statistics

May Temperature

Ontario International Airport (5 miles)

  • Lowest 6 May, 2026

    49.6 °F

  • Average May

    68.1 °F

  • Highest 11 May, 2026

    96.7 °F

Climate (2021–Present)

Ontario International Airport (5 miles)

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

  • Average Low 2021–2026

    55.8 °F

  • Average 2021–2026

    67.1 °F

  • Average High 2021–2026

    79.4 °F
Get WillyWeather+ to remove ads