Montesano Weather Forecast

    • 48
    • 71

    Increasing Clouds

    • 51
    • 71

    Mostly Cloudy

    • 48
    • 69

    Partly Sunny

    • 47
    • 66

    Mostly Cloudy

    • 48
    • 62

    Chance Rain

    • 44
    • 62

    Slight Chance Thunderstorms

    • 44
    • 64

    Mostly Cloudy

Today 20 Sep Lower Chehalis River Valley

Partly sunny. A slight chance of rain in the afternoon. Highs in the mid 60s.

Tonight 20 Sep Lower Chehalis River Valley

Partly cloudy. Patchy fog after midnight. Lows in the mid 40s to lower 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 8 September, 2026

    48.7 °F

  • Average September

    60.9 °F

  • Highest 17 September, 2026

    76.6 °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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