Montesano Weather Forecast

    • 49
    • 79

    Becoming Sunny

    • 52
    • 79

    Mostly Sunny

    • 50
    • 67

    Mostly Cloudy

    • 49
    • 72

    Partly Sunny

    • 51
    • 73

    Partly Sunny

    • 51
    • 69

    Mostly Cloudy

Today 16 Sep Lower Chehalis River Valley

Sunny. Patchy fog in the morning. Highs in the 70s to lower 80s. Light wind becoming northeast to 10 Mph in the afternoon.

Tonight 16 Sep Lower Chehalis River Valley

Clear. Lows near 50. Light wind.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 8 September, 2026

    48.7 °F

  • Average September

    60.7 °F

  • Highest 9 September, 2026

    73.7 °F

Climate (2021–2026)

Hoquiam, Bowerman Airport (14.9 miles)

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  • Average Low 2021–2026

    46.3 °F

  • Average 2021–2026

    52.4 °F

  • Average High 2021–2026

    58.6 °F
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