Hillsboro Weather Forecast

    • 49
    • 71

    Decreasing Clouds

    • 53
    • 67

    Rain

    • 46
    • 62

    Rain

    • 46
    • 64

    Mostly Cloudy

    • 46
    • 66

    Mostly Cloudy

    • 48
    • 66

    Mostly Cloudy

Today 23 Sep Tualatin Valley

Mostly cloudy in the Morning, then becoming partly sunny. Highs in the lower 70s. Light and variable Winds, becoming light in the afternoon.

Tonight 23 Sep Tualatin Valley

Mostly clear in the Evening, then becoming partly cloudy. Lows in the upper 40s. Winds light.

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Hillsboro Temperature Statistics

September Temperature

Portland-Hillsboro Airport (1.9 miles)

  • Lowest 19 September, 2026

    44.7 °F

  • Average September

    62.2 °F

  • Highest 9 September, 2026

    89.7 °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

    64.4 °F
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