Riverton Weather Forecast

    • 67
    • 86

    Slight Chance Thunderstorms

    • 64
    • 86

    Partly Sunny

    • 67
    • 87

    Chance Thunderstorms

    • 67
    • 86

    Rain Showers Likely

    • 65
    • 81

    Rain Showers Likely

    • 63
    • 81

    Chance Thunderstorms

Today 8 Aug Western Pendleton

Mostly sunny with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. Except in the upper 70s at the higher Elevations. West Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

Tonight 8 Aug Western Pendleton

Partly cloudy in the Evening, then mostly cloudy with a slight chance of Showers after midnight. Lows in the mid 60s. West Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of rain 20 percent.

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Riverton Temperature Statistics

August Temperature

Petersburg, Grant County Airport (23 miles)

  • Lowest 4 August, 2026

    57.4 °F

  • Average August

    74.9 °F

  • Highest 5 August, 2026

    88.7 °F

Climate (2021–2026)

Petersburg, Grant County Airport (23 miles)

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  • Average Low 2021–2026

    44.3 °F

  • Average 2021–2026

    55.5 °F

  • Average High 2021–2026

    67.5 °F
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