Commonwealth Lake Weather Forecast

    • 39
    • 51

    Chance Rain Showers

    • 42
    • 51

    Chance Rain Showers

    • 42
    • 53

    Chance Rain Showers

    • 42
    • 57

    Mostly Cloudy

    • 40
    • 54

    Partly Sunny

    • 37
    • 54

    Mostly Sunny

Today 10 Jan Tualatin Valley

Mostly cloudy. Patchy fog in the morning. A slight chance of rain Showers in the afternoon. Highs around 50. Winds light. Chance of rain 20 percent.

Tonight 10 Jan Tualatin Valley

Mostly cloudy. A slight chance of rain Showers in the Evening, then a chance of rain Showers after midnight. Patchy fog. Lows in the upper 30s. Light and variable Winds. Chance of rain 50 percent. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Commonwealth Lake Temperature Statistics

January Temperature

Portland-Hillsboro Airport (7.5 miles)

  • Lowest 1 January, 2026

    32 °F

  • Average January

    42.4 °F

  • Highest 3 January, 2026

    52 °F

Climate (2021–Present)

Portland-Hillsboro Airport (7.5 miles)

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  • Average Low 2021–2026

    43.4 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    64.4 °F
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