Riverton Weather Forecast

    • 51
    • 61

    Rain

    • 48
    • 57

    Rain Likely

    • 43
    • 60

    Partly Sunny

    • 45
    • 66

    Mostly Sunny

    • 47
    • 66

    Mostly Sunny

    • 48
    • 66

    Partly Sunny

    • 50
    • 68

    Partly Sunny

Today 22 Sep Western Pendleton

Rain with possible Thunderstorms and drizzle. Patchy fog. Highs in the upper 50s. East Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of rain near 100 percent.

Tonight 22 Sep Western Pendleton

Patchy drizzle. Rain, mainly in the evening. Patchy fog. Lows in the upper 40s. East Winds 10 to 15 Mph with Gusts up to 30 Mph. Chance of rain 90 percent.

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Riverton Temperature Statistics

September Temperature

Petersburg, Grant County Airport (23 miles)

  • Lowest 15 September, 2026

    48.2 °F

  • Average September

    72.8 °F

  • Highest 2 September, 2026

    96.3 °F

Climate (2021–2026)

Petersburg, Grant County Airport (23 miles)

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  • Average Low 2021–2026

    44.3 °F

  • Average 2021–2026

    55.4 °F

  • Average High 2021–2026

    67.4 °F
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