Monmouth Weather Forecast

    • 41
    • 46

    Rain

    • 38
    • 50

    Rain Likely

    • 39
    • 49

    Rain Likely

    • 36
    • 49

    Rain Likely

    • 33
    • 46

    Patchy Fog

    • 32
    • 45

    Mostly Cloudy

Today 23 Dec West Central Willamette Valley

Mostly cloudy. A slight chance of rain this afternoon. Highs in the mid 40s. Winds light. Chance of rain 20 percent.

Tonight 23 Dec West Central Willamette Valley

A chance of rain in the Evening, then rain after midnight. Lows around 40. North wind 5 to 10 Mph. Chance of rain 90 percent. Rainfall Amounts around a quarter of an inch.

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Monmouth Temperature Statistics

December Temperature

Salem - McNary Field (11.8 miles)

  • Lowest 1 December, 2025

    32 °F

  • Average December

    48.9 °F

  • Highest 10 December, 2025

    62.1 °F

Climate (2020–Present)

Salem - McNary Field (11.8 miles)

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  • Average Low 2020–2025

    45.9 °F

  • Average 2020–2025

    55.5 °F

  • Average High 2020–2025

    65.7 °F
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