Arlington Heights Weather Forecast

    • 56
    • 80

    Mostly Sunny

    • 56
    • 75

    Increasing Clouds

    • 53
    • 72

    Partly Sunny

    • 53
    • 70

    Mostly Cloudy

    • 53
    • 67

    Rain Likely

    • 49
    • 63

    Chance Rain

    • 49
    • 65

    Mostly Cloudy

Today 20 Sep West Hills and Chehalem Mountains

Mostly sunny. Highs in the mid 60s.

Tonight 20 Sep West Hills and Chehalem Mountains

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

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Arlington Heights Temperature Statistics

September Temperature

Portland, Portland International Airport (6.8 miles)

  • Lowest 8 September, 2026

    51.7 °F

  • Average September

    64.8 °F

  • Highest 9 September, 2026

    88.6 °F

Climate (2021–2026)

Portland, Portland International Airport (6.8 miles)

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  • Average Low 2021–2026

    48.3 °F

  • Average 2021–2026

    56.3 °F

  • Average High 2021–2026

    65.4 °F
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