Montesano Weather Forecast

    • 49
    • 70

    Increasing Clouds

    • 50
    • 71

    Slight Chance Rain

    • 52
    • 72

    Partly Sunny

    • 53
    • 68

    Mostly Cloudy

    • 53
    • 73

    Mostly Cloudy

    • 56
    • 80

    Partly Sunny

    • 55
    • 73

    Mostly Cloudy

Today 4 Sep Lower Chehalis River Valley

Partly sunny. Highs in the mid 60s to lower 70s. Light wind becoming east to 10 Mph in the afternoon.

Tonight 4 Sep Lower Chehalis River Valley

Mostly cloudy. Lows near 50. 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 2 September, 2026

    57.9 °F

  • Average September

    61.8 °F

  • Highest 1 September, 2026

    66.7 °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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