Monmouth Weather Forecast

    • 40
    • 59

    Chance Rain Showers

    • 41
    • 63

    Partly Sunny

    • 42
    • 69

    Mostly Sunny

    • 45
    • 71

    Partly Sunny

    • 47
    • 74

    Mostly Sunny

    • 47
    • 77

    Partly Sunny

Today 16 May West Central Willamette Valley

Partly sunny with a chance of Showers with a slight chance of Thunderstorms. Highs in the upper 50s. West wind 10 to 15 Mph. Chance of rain 50 percent. Rainfall Amounts around a tenth of an Inch, except higher Amounts possible in Thunderstorms.

Tonight 16 May West Central Willamette Valley

Mostly cloudy with a slight chance of rain Showers in the Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 30s. West wind 10 to 15 Mph, easing to light after midnight. Chance of rain 20 percent.

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Monmouth Temperature Statistics

May Temperature

Salem - McNary Field (11.8 miles)

  • Lowest 9 May, 2026

    45.6 °F

  • Average May

    61.6 °F

  • Highest 3 May, 2026

    89.7 °F

Climate (2021–Present)

Salem - McNary Field (11.8 miles)

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  • Average Low 2021–2026

    46 °F

  • Average 2021–2026

    55.6 °F

  • Average High 2021–2026

    65.9 °F
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