Iowa Speedway Weather Forecast

    • 60
    • 78

    Chance Thunderstorms

    • 67
    • 86

    Slight Chance Thunderstorms

    • 77
    • 93

    Slight Chance Thunderstorms

    • 76
    • 96

    Sunny

    • 75
    • 96

    Mostly Sunny

    • 71
    • 94

    Chance Thunderstorms

    • 70
    • 91

    Rain Showers Likely

Today 18 Jun Jasper

Mostly cloudy with a chance of Showers and Thunderstorms. Highs in the upper 70s. North Winds 5 to 10 Mph. Chance of rain 50 percent.

Tonight 18 Jun Jasper

Mostly cloudy with Showers and Thunderstorms likely this Evening, then mostly clear after midnight. Lows around 60. Northwest Winds 5 to 10 Mph. Chance of rain 70 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Iowa Speedway Temperature Statistics

June Temperature

Newton Municipal Airport - Earl Johnson Field (0 miles)

  • Lowest 10 June, 2025

    48.2 °F

  • Average June

    70.1 °F

  • Highest 11 June, 2025

    93.2 °F

Climate (2020–Present)

Newton Municipal Airport - Earl Johnson Field (0 miles)

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  • Average Low 2020–2025

    41.2 °F

  • Average 2020–2025

    51 °F

  • Average High 2020–2025

    60.9 °F
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