Iowa Speedway Weather Forecast

    • 70
    • 84

    Thunderstorms Likely

    • 61
    • 81

    Slight Chance Thunderstorms

    • 65
    • 82

    Partly Sunny

    • 65
    • 83

    Rain Showers Likely

    • 59
    • 78

    Slight Chance Thunderstorms

    • 60
    • 77

    Slight Chance Thunderstorms

    • 62
    • 79

    Slight Chance Thunderstorms

Today 15 Aug Jasper

Mostly cloudy with a slight chance of Showers and Thunderstorms. Near steady temperature in the lower 80s. West Winds around 5 Mph. Chance of rain 20 percent.

Tonight 15 Aug Jasper

Mostly cloudy. A slight chance of Showers and Thunderstorms Early, then Showers likely with a chance of Thunderstorms. Humid with Lows around 70. Northwest Winds around 5 Mph. Chance of rain 60 percent.

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  • Temperature Real-Time

Iowa Speedway Temperature Statistics

August Temperature

Newton Municipal Airport - Earl Johnson Field (0 miles)

  • Lowest 1 August, 2026

    62.6 °F

  • Average August

    73.7 °F

  • Highest 11 August, 2026

    89.6 °F

Climate (2021–2026)

Newton Municipal Airport - Earl Johnson Field (0 miles)

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  • Average Low 2021–2026

    41.4 °F

  • Average 2021–2026

    51.3 °F

  • Average High 2021–2026

    61.4 °F
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