Helena Weather Forecast

    • 55
    • 79

    Increasing Clouds

    • 51
    • 76

    Mostly Cloudy

    • 50
    • 81

    Mostly Sunny

    • 58
    • 84

    Partly Sunny

    • 63
    • 86

    Chance Rain Showers

    • 63
    • 86

    Chance Thunderstorms

Today 31 May Iowa

Mostly cloudy. Highs in the upper 70s. Southeast Winds 5 to 10 Mph.

Tonight 31 May Iowa

Mostly cloudy. A 20 percent chance of light rain Showers in the late evening and overnight. Lows in the mid 50s. East Winds up to 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Helena Temperature Statistics

May Temperature

Lone Rock Tri-County Regional Airport (8.7 miles)

  • Lowest 6 May, 2026

    27.6 °F

  • Average May

    58.6 °F

  • Highest 27 May, 2026

    88.6 °F

Climate (2021–Present)

Lone Rock Tri-County Regional Airport (8.7 miles)

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  • Average Low 2021–2026

    38.6 °F

  • Average 2021–2026

    49.4 °F

  • Average High 2021–2026

    60.3 °F
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