Petersburg Weather Forecast

    • 68
    • 90

    Chance Thunderstorms

    • 60
    • 84

    Chance Rain Showers

    • 62
    • 81

    Mostly Cloudy

    • 62
    • 86

    Rain Showers Likely

    • 60
    • 79

    Rain Showers Likely

    • 59
    • 77

    Rain Showers Likely

Today 17 Sep Eastern Grant

Mostly sunny. Patchy fog this morning. Scattered Showers and Thunderstorms this afternoon. Highs in the upper 80s. West Winds around 5 Mph. Chance of rain 50 percent.

Tonight 17 Sep Eastern Grant

Mostly cloudy with isolated Showers and Thunderstorms in the Evening, then partly cloudy after midnight. Patchy fog after midnight. Lows in the upper 60s. Southwest Winds around 5 Mph, becoming northwest after midnight. Chance of rain 20 percent.

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Petersburg Temperature Statistics

September Temperature

Petersburg, Grant County Airport (0.6 miles)

  • Lowest 8 September, 2026

    55.8 °F

  • Average September

    73.6 °F

  • Highest 2 September, 2026

    96.3 °F

Climate (2021–2026)

Petersburg, Grant County Airport (0.6 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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