Hillsboro Weather Forecast

    • 48
    • 69

    Decreasing Clouds

    • 50
    • 73

    Partly Sunny

    • 53
    • 82

    Mostly Sunny

    • 51
    • 81

    Mostly Sunny

    • 49
    • 79

    Partly Sunny

    • 50
    • 76

    Mostly Cloudy

    • 45
    • 64

    Chance Rain

Today 19 May Tualatin Valley

Partly sunny. Highs in the lower 70s. Light and variable Winds, becoming light this afternoon.

Tonight 19 May Tualatin Valley

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 40s. Northwest wind 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Hillsboro Temperature Statistics

May Temperature

Portland-Hillsboro Airport (1.9 miles)

  • Lowest 17 May, 2026

    37 °F

  • Average May

    59.3 °F

  • Highest 3 May, 2026

    90.6 °F

Climate (2021–Present)

Portland-Hillsboro Airport (1.9 miles)

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

  • Average Low 2021–2026

    43.5 °F

  • Average 2021–2026

    53.9 °F

  • Average High 2021–2026

    64.6 °F
Get WillyWeather+ to remove ads