Montesano Weather Forecast

    • 51
    • 76

    Becoming Sunny

    • 56
    • 80

    Partly Sunny

    • 52
    • 68

    Mostly Cloudy

    • 50
    • 65

    Chance Rain

    • 51
    • 68

    Chance Rain Showers

    • 51
    • 70

    Partly Sunny

    • 51
    • 73

    Partly Sunny

Today 8 Sep Lower Chehalis River Valley

Mostly cloudy in the morning then becoming mostly sunny. Highs in the 70s. Light wind becoming northwest to 10 Mph in the afternoon.

Tonight 8 Sep Lower Chehalis River Valley

Mostly clear. Lows in the lower to mid 50s. Northwest wind to 10 Mph in the evening becoming light.

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Montesano Temperature Statistics

September Temperature

Hoquiam, Bowerman Airport (14.9 miles)

  • Lowest 4 September, 2026

    49.6 °F

  • Average September

    60.9 °F

  • Highest 5 September, 2026

    71.7 °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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