Indianapolis International Airport Weather Forecast

    • 57
    • 72

    Chance Rain Showers

    • 56
    • 69

    Mostly Cloudy

    • 55
    • 68

    Mostly Cloudy

    • 54
    • 70

    Mostly Cloudy

    • 51
    • 71

    Partly Sunny

    • 53
    • 74

    Partly Sunny

Today 21 Sep Marion

Mostly cloudy. Scattered Showers through early Afternoon, then isolated Showers late in the afternoon. Not as warm with Highs in the lower 70s. Northeast Winds around 10 Mph with Gusts up to 20 Mph. Chance of rain 30 percent.

Tonight 21 Sep Marion

Mostly cloudy. Lows in the upper 50s. Northeast Winds around 10 Mph with Gusts up to 20 Mph.

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Indianapolis International Airport Temperature Statistics

September Temperature

Indianapolis International Airport (0.6 miles)

  • Lowest 14 September, 2026

    58.6 °F

  • Average September

    79.5 °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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