Indianapolis International Airport Weather Forecast

    • 66
    • 80

    Mostly Cloudy

    • 70
    • 87

    Rain Showers Likely

    • 63
    • 86

    Chance Thunderstorms

    • 57
    • 73

    Rain Showers Likely

    • 57
    • 70

    Slight Chance Rain Showers

    • 56
    • 70

    Mostly Cloudy

    • 57
    • 72

    Mostly Cloudy

Today 18 Sep Marion

Partly cloudy. Not as warm with Highs in the upper 70s. Northeast Winds 5 to 10 Mph.

Tonight 18 Sep Marion

Partly cloudy. Scattered Sprinkles toward daybreak. Lows in the mid 60s. East Winds 5 to 10 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

    79.4 °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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