Riverton Weather Forecast

    • 49
    • 62

    Rain

    • 48
    • 63

    Partly Sunny

    • 48
    • 65

    Partly Sunny

    • 52
    • 65

    Chance Rain

    • 53
    • 63

    Chance Rain

    • 51
    • 64

    Slight Chance Rain

Today 25 Sep Lowlands of Pierce and Southern King Counties

Breezy. Showers likely in the morning. A slight chance of Thunderstorms through the day. Showers in the afternoon. Rainfall Amounts a quarter to a half inch Possible, except higher Amounts possible in Thunderstorms. Highs in the mid 50s to lower 60s. Southwest wind 15 to 25 Mph with Gusts to 45 Mph.

Tonight 25 Sep Lowlands of Pierce and Southern King Counties

Mostly clear. A slight chance of Showers in the evening. Lows in the 40s. Southwest wind 10 to 20 Mph. Gusts to 35 Mph in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Riverton Temperature Statistics

September Temperature

Seattle, Seattle-Tacoma International Airport (2.5 miles)

  • Lowest 20 September, 2026

    50.6 °F

  • Average September

    62.2 °F

  • Highest 9 September, 2026

    78.7 °F

Climate (2021–2026)

Seattle, Seattle-Tacoma International Airport (2.5 miles)

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  • Average Low 2021–2026

    46.6 °F

  • Average 2021–2026

    53.5 °F

  • Average High 2021–2026

    61.3 °F
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