Lost Lake Weather Forecast

    • 49
    • 61

    Mostly Sunny

    • 53
    • 72

    Mostly Sunny

    • 52
    • 76

    Mostly Sunny

    • 48
    • 68

    Partly Sunny

    • 46
    • 62

    Partly Sunny

    • 49
    • 64

    Mostly Cloudy

Today 18 Sep North Oregon Cascades

Sunny. Free air freezing level 13000 feet. Winds light.

Tonight 18 Sep North Oregon Cascades

Mostly clear. Free air freezing level 13000 feet. Winds light.

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  • Temperature Real-Time

Lost Lake Temperature Statistics

September Temperature

Portland, Portland-Troutdale Airport (28.6 miles)

  • Lowest 16 September, 2026

    46.9 °F

  • Average September

    62.8 °F

  • Highest 9 September, 2026

    88.6 °F

Climate (2021–2026)

Portland, Portland-Troutdale Airport (28.6 miles)

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  • Average Low 2021–2026

    47.5 °F

  • Average 2021–2026

    56.2 °F

  • Average High 2021–2026

    65.2 °F
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