Petersburg Weather Forecast

    • 45
    • 71

    Becoming Sunny

    • 51
    • 73

    Mostly Sunny

    • 40
    • 66

    Partly Sunny

    • 46
    • 65

    Mostly Cloudy

    • 48
    • 68

    Chance Rain Showers

    • 50
    • 67

    Chance Rain Showers

Today 28 Oct Mahoning

Partly sunny this Morning, then clearing. Highs in the lower 70s. South Winds around 5 Mph.

Tonight 28 Oct Mahoning

Mostly clear. Lows in the upper 40s. South Winds around 5 Mph.

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Petersburg Temperature Statistics

October Temperature

New Castle, New Castle Municipal Airport (9.3 miles)

  • Lowest 18 October, 2026

    27 °F

  • Average October

    54.1 °F

  • Highest 13 October, 2026

    84 °F

Climate (2021–2026)

New Castle, New Castle Municipal Airport (9.3 miles)

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  • Average Low 2021–2026

    41.6 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.1 °F
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