Indianapolis International Airport Weather Forecast

    • 64
    • 84

    Chance Rain Showers

    • 60
    • 80

    Slight Chance Thunderstorms

    • 55
    • 77

    Mostly Sunny

    • 58
    • 76

    Partly Sunny

    • 62
    • 77

    Mostly Cloudy

    • 64
    • 81

    Slight Chance Thunderstorms

    • 64
    • 82

    Partly Sunny

Today 21 Aug Marion

Mostly sunny. Highs in the lower 80s. South Winds around 5 Mph, becoming west around 5 Mph late.

Tonight 21 Aug Marion

Mostly clear through the late Overnight, then partly cloudy with a chance of Showers toward daybreak. Patchy fog toward daybreak. Lows in the mid 60s. West Winds around 5 Mph. Chance of rain 40 percent.

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Indianapolis International Airport Temperature Statistics

August Temperature

Indianapolis International Airport (0.6 miles)

  • Lowest 18 August, 2026

    63.6 °F

  • Average August

    77.1 °F

  • Highest 8 August, 2026

    90.6 °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

    65.2 °F
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