Gaston Weather Forecast

    • 41
    • 61

    Chance Rain Showers

    • 48
    • 67

    Partly Sunny

    • 44
    • 66

    Mostly Cloudy

    • 44
    • 67

    Mostly Cloudy

    • 47
    • 71

    Mostly Sunny

    • 50
    • 79

    Chance Rain Showers

Today 20 May Tualatin Valley

Partly sunny with a 50 percent chance of rain Showers. Highs in the lower 60s. Winds light. Rainfall Amounts less than a tenth of an inch.

Tonight 20 May Tualatin Valley

Partly cloudy. Lows in the lower 40s. Winds light in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Gaston Temperature Statistics

May Temperature

Portland-Hillsboro Airport (11.8 miles)

  • Lowest 4 May, 2025

    35.6 °F

  • Average May

    54.3 °F

  • Highest 6 May, 2025

    80.6 °F

Climate (2020–Present)

Portland-Hillsboro Airport (11.8 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    53.4 °F

  • Average High 2020–2025

    64.1 °F
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