Helena Weather Forecast

    • 42
    • 67

    Chance Rain Showers

    • 41
    • 63

    Partly Sunny

    • 44
    • 62

    Chance Rain Showers

    • 47
    • 63

    Chance Rain Showers

    • 50
    • 72

    Mostly Cloudy

    • 55
    • 79

    Slight Chance Thunderstorms

Today 19 May Iowa

Cooler. Cloudy with a 40 percent chance of light rain Showers in the Morning, then mostly cloudy in the late morning and afternoon. Highs in the mid 60s. West Winds 10 to 15 Mph with Gusts to around 30 Mph.

Tonight 19 May Iowa

Much Colder. Mostly cloudy through around midnight then becoming partly cloudy. Lows in the lower 40s. Northwest Winds 5 to 15 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

    53.8 °F

  • Highest 16 May, 2026

    85.6 °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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