Helena Weather Forecast

    • 59
    • 83

    Chance Thunderstorms

    • 52
    • 79

    Mostly Sunny

    • 52
    • 77

    Mostly Sunny

    • 58
    • 78

    Partly Sunny

    • 62
    • 80

    Chance Rain Showers

    • 60
    • 83

    Partly Sunny

    • 59
    • 82

    Partly Sunny

Today 21 Aug Iowa

Showers and Thunderstorms likely. Some Thunderstorms may be severe with damaging Winds and large hail. West Winds 5 to 10 Mph. Chance of precipitation 70 percent.

Tonight 21 Aug Iowa

Mostly clear. A 20 percent chance of Thunderstorms in the evening. Some Thunderstorms may be severe with damaging Winds and large hail. Lows in the lower 60s. Northwest Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Helena Temperature Statistics

August Temperature

Lone Rock Tri-County Regional Airport (8.7 miles)

  • Lowest 3 August, 2026

    57.7 °F

  • Average August

    71.7 °F

  • Highest 10 August, 2026

    85.6 °F

Climate (2021–2026)

Lone Rock Tri-County Regional Airport (8.7 miles)

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  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    49.5 °F

  • Average High 2021–2026

    60.4 °F
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