Helena Weather Forecast

    • 61
    • 86

    Chance Rain Showers

    • 59
    • 80

    Chance Thunderstorms

    • 61
    • 80

    Chance Rain Showers

    • 61
    • 80

    Chance Thunderstorms

    • 57
    • 80

    Chance Rain Showers

    • 55
    • 77

    Partly Sunny

Today 18 Sep Iowa

Partly sunny. A 20 percent chance of light Showers in the morning. Highs in the mid 80s. Southeast Winds up to 5 Mph.

Tonight 18 Sep Iowa

Partly cloudy with slight chance of light Showers and Thunderstorms through around Midnight, then mostly cloudy with chance of light Showers after midnight. Lows around 60. East Winds up to 10 Mph. Chance of precipitation 30 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Helena Temperature Statistics

September Temperature

Lone Rock Tri-County Regional Airport (8.7 miles)

  • Lowest 7 September, 2025

    37.9 °F

  • Average September

    62.3 °F

  • Highest 15 September, 2025

    86 °F

Climate (2020–Present)

Lone Rock Tri-County Regional Airport (8.7 miles)

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  • Average Low 2020–2025

    38.6 °F

  • Average 2020–2025

    49.2 °F

  • Average High 2020–2025

    60 °F
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