Helena Weather Forecast

    • 70
    • 82

    Slight Chance Thunderstorms

    • 70
    • 89

    Slight Chance Thunderstorms

    • 69
    • 90

    Slight Chance Thunderstorms

    • 68
    • 89

    Chance Thunderstorms

    • 67
    • 84

    Chance Thunderstorms

    • 65
    • 85

    Partly Sunny

    • 62
    • 84

    Partly Sunny

Today 30 Aug Iowa

Mostly cloudy with scattered light Showers and Thunderstorms. South Winds 10 to 15 Mph. Chance of precipitation 50 percent.

Tonight 30 Aug Iowa

Partly cloudy through around Midnight, then mostly cloudy with a 20 percent chance of light Showers and Thunderstorms after midnight. Lows in the lower 70s. South Winds 5 to 15 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 24 August, 2026

    48.9 °F

  • Average August

    70.4 °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

    60.3 °F
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