Cathlamet Weather Forecast

    • 53
    • 66

    Rain Showers Likely

    • 55
    • 66

    Rain Showers

    • 53
    • 65

    Rain Showers

    • 53
    • 64

    Rain Showers

    • 52
    • 67

    Chance Rain

    • 48
    • 66

    Slight Chance Rain Showers

Today 29 Sep Willapa and Wahkiakum Lowlands

Rain this Morning, then Showers likely this afternoon. Highs in the mid 60s. South wind 5 to 10 Mph. Chance of rain near 100 percent. Rainfall Amounts a quarter to a half of an inch.

Tonight 29 Sep Willapa and Wahkiakum Lowlands

Mostly cloudy with a chance of Showers in the Evening, then partly cloudy with a chance of rain after midnight. Lows in the lower 50s. Southeast wind 5 to 10 Mph. Chance of rain 50 percent. Rainfall Amounts less than a tenth of an inch.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Cathlamet Temperature Statistics

September Temperature

Southwest Washington Regional Airport (23.6 miles)

  • Lowest 26 September, 2025

    44.1 °F

  • Average September

    64.4 °F

  • Highest 16 September, 2025

    91.9 °F

Climate (2020–Present)

Southwest Washington Regional Airport (23.6 miles)

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  • Average Low 2020–2025

    45 °F

  • Average 2020–2025

    52.8 °F

  • Average High 2020–2025

    62.3 °F
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