Cornelius Weather Forecast

    • 55
    • 85

    Mostly Sunny

    • 53
    • 85

    Partly Sunny

    • 55
    • 82

    Partly Sunny

    • 56
    • 86

    Partly Sunny

    • 55
    • 83

    Slight Chance Rain

    • 54
    • 78

    Partly Sunny

Today 17 Aug Tualatin Valley

Mostly sunny. Highs in the mid 80s. Winds light.

Tonight 17 Aug Tualatin Valley

Mostly clear. Lows in the mid 50s. Winds light.

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Cornelius Temperature Statistics

August Temperature

Portland-Hillsboro Airport (5 miles)

  • Lowest 2 August, 2026

    49.6 °F

  • Average August

    69.6 °F

  • Highest 6 August, 2026

    95.6 °F

Climate (2021–2026)

Portland-Hillsboro Airport (5 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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