Iowa Speedway Weather Forecast

    • 61
    • 88

    Thunderstorms Likely

    • 62
    • 85

    Rain Showers

    • 67
    • 87

    Rain Showers Likely

    • 63
    • 88

    Thunderstorms Likely

    • 47
    • 76

    Slight Chance Rain Showers

    • 47
    • 68

    Partly Sunny

Today 15 May Jasper

Sunny. Highs in the upper 80s. South Winds 10 to 15 Mph.

Tonight 15 May Jasper

Thunderstorms likely. Showers. Some Thunderstorms may be severe. Lows around 60. South Winds 10 to 15 Mph, becoming southwest 5 to 10 Mph after midnight. Chance of rain 90 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Iowa Speedway Temperature Statistics

May Temperature

Newton Municipal Airport - Earl Johnson Field (0 miles)

  • Lowest 1 May, 2026

    35.6 °F

  • Average May

    58 °F

  • Highest 4 May, 2026

    84.2 °F

Climate (2021–Present)

Newton Municipal Airport - Earl Johnson Field (0 miles)

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  • Average Low 2021–2026

    41.6 °F

  • Average 2021–2026

    51.5 °F

  • Average High 2021–2026

    61.6 °F
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