Porter Weather Forecast

    • 50
    • 71

    Rain

    • 53
    • 66

    Rain

    • 47
    • 69

    Mostly Cloudy

    • 47
    • 74

    Partly Sunny

    • 51
    • 82

    Mostly Sunny

    • 52
    • 85

    Mostly Sunny

    • 52
    • 84

    Partly Sunny

Today 12 Sep Middle Chehalis River Valley

Cloudy in the morning then becoming mostly cloudy. A slight chance of rain late in the afternoon. Highs in the mid 60s to lower 70s. Light wind.

Tonight 12 Sep Middle Chehalis River Valley

A slight chance of Thunderstorms in the evening. Rain. Patchy fog late in the evening. Rainfall Amounts a quarter to a half inch Possible, except higher Amounts possible in Thunderstorms. Lows near 50. Light wind becoming west to 10 Mph after midnight.

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Porter Temperature Statistics

September Temperature

Olympia, Olympia Airport (19.3 miles)

  • Lowest 8 September, 2026

    44.7 °F

  • Average September

    60.6 °F

  • Highest 9 September, 2026

    82 °F

Climate (2021–2026)

Olympia, Olympia Airport (19.3 miles)

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  • Average Low 2021–2026

    41.7 °F

  • Average 2021–2026

    51.9 °F

  • Average High 2021–2026

    62.2 °F
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