Hillsboro Weather Forecast

    • 57
    • 87

    Increasing Clouds

    • 49
    • 77

    Mostly Cloudy

    • 53
    • 70

    Mostly Cloudy

    • 52
    • 68

    Rain Showers Likely

    • 53
    • 72

    Mostly Sunny

    • 54
    • 76

    Mostly Sunny

Today 9 Sep Tualatin Valley

Sunny. Highs in the upper 80s. Winds light.

Tonight 9 Sep Tualatin Valley

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 50s. Light and variable Winds.

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  • Temperature Real-Time

Hillsboro Temperature Statistics

September Temperature

Portland-Hillsboro Airport (1.9 miles)

  • Lowest 4 September, 2026

    51.7 °F

  • Average September

    60.9 °F

  • Highest 5 September, 2026

    72.6 °F

Climate (2021–2026)

Portland-Hillsboro Airport (1.9 miles)

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  • Average Low 2021–2026

    43.5 °F

  • Average 2021–2026

    53.8 °F

  • Average High 2021–2026

    64.3 °F
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