Helena Weather Forecast

    • 70
    • 82

    Chance Thunderstorms

    • 59
    • 81

    Partly Sunny

    • 61
    • 81

    Partly Sunny

    • 62
    • 81

    Rain Showers Likely

    • 55
    • 76

    Partly Sunny

    • 55
    • 74

    Slight Chance Thunderstorms

Today 15 Aug Iowa

Partly sunny. Isolated Sprinkles early in the Afternoon, then isolated light Showers and Thunderstorms late in the afternoon. Near steady temperature in the upper 70s. Southeast Winds up to 5 Mph. Chance of precipitation 20 percent.

Tonight 15 Aug Iowa

Partly cloudy in the evening then becoming mostly cloudy. A 50 percent chance of light Showers and Thunderstorms in the late evening and overnight. Lows around 70. Southwest 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

    71.8 °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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