Hillsboro Weather Forecast

    • 41
    • 49

    Rain

    • 41
    • 56

    Rain

    • 39
    • 48

    Rain

    • 39
    • 47

    Rain Likely

    • 40
    • 47

    Rain

    • 38
    • 48

    Chance Rain

Today 17 Dec Tualatin Valley

A slight chance of Thunderstorms. Rain Showers. Highs in the upper 40s. Southwest wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts around a tenth of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 17 Dec Tualatin Valley

Cloudy. A chance of rain Showers in the Evening, then rain after midnight. Lows around 40. South wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts a tenth to a quarter of an inch.

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Hillsboro Temperature Statistics

December Temperature

Portland-Hillsboro Airport (1.9 miles)

  • Lowest 1 December, 2025

    30 °F

  • Average December

    49 °F

  • Highest 15 December, 2025

    63 °F

Climate (2020–Present)

Portland-Hillsboro Airport (1.9 miles)

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  • Average Low 2020–2025

    43.4 °F

  • Average 2020–2025

    53.7 °F

  • Average High 2020–2025

    64.4 °F
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