Indianapolis International Airport Weather Forecast

    • 56
    • 86

    Isolated Thunderstorms

    • 62
    • 79

    Mostly Sunny

    • 69
    • 91

    Partly Sunny

    • 71
    • 90

    Chance Thunderstorms

    • 68
    • 90

    Chance Thunderstorms

    • 66
    • 85

    Chance Rain Showers

    • 65
    • 86

    Chance Rain Showers

Today 13 Sep Marion

Mostly sunny Early, then becoming partly cloudy. A slight chance of Showers late. Highs in the upper 80s. Northwest Winds 5 to 10 Mph. Gusts up to 20 Mph late. Chance of rain 20 percent.

Tonight 13 Sep Marion

Partly cloudy with a slight chance of Showers late this Afternoon, then mostly clear. Cooler with Lows in the mid 50s. North Winds 10 to 15 Mph, becoming northeast 5 to 10 Mph toward daybreak. Chance of rain 20 percent.

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Indianapolis International Airport Temperature Statistics

September Temperature

Indianapolis International Airport (0.6 miles)

  • Lowest 7 September, 2026

    62.7 °F

  • Average September

    80.8 °F

  • Highest 4 September, 2026

    97.6 °F

Climate (2021–2026)

Indianapolis International Airport (0.6 miles)

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  • Average Low 2021–2026

    46.8 °F

  • Average 2021–2026

    55.8 °F

  • Average High 2021–2026

    65.3 °F
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