Cottage Grove Weather Forecast

    • 57
    • 84

    Mostly Sunny

    • 54
    • 83

    Partly Sunny

    • 61
    • 83

    Partly Sunny

    • 62
    • 86

    Slight Chance Thunderstorms

    • 62
    • 83

    Chance Rain Showers

    • 59
    • 82

    Chance Rain Showers

Today 18 Sep Mahoning

Patchy fog this morning. Mostly sunny. Highs in the mid 80s. Northwest Winds around 5 Mph.

Tonight 18 Sep Mahoning

Mostly clear. Lows in the mid 50s. North Winds around 5 Mph in the Evening, becoming light and variable.

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Cottage Grove Temperature Statistics

September Temperature

New Castle, New Castle Municipal Airport (12.4 miles)

  • Lowest 8 September, 2025

    37.9 °F

  • Average September

    62.1 °F

  • Highest 15 September, 2025

    84 °F

Climate (2020–Present)

New Castle, New Castle Municipal Airport (12.4 miles)

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  • Average Low 2020–2025

    41.9 °F

  • Average 2020–2025

    51.4 °F

  • Average High 2020–2025

    61.1 °F
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