Helena Weather Forecast

    • 46
    • 63

    Mostly Cloudy

    • 43
    • 63

    Partly Sunny

    • 45
    • 66

    Partly Sunny

    • 47
    • 67

    Mostly Cloudy

    • 47
    • 68

    Mostly Cloudy

    • 50
    • 67

    Mostly Cloudy

Today 21 Sep Iowa

Mostly cloudy. Slight chance of Sprinkles in the morning. Slight chance of Sprinkles and drizzle late in the afternoon. Highs in the lower 60s. Northeast Winds 10 to 15 Mph. Chance of Showers 20 percent.

Tonight 21 Sep Iowa

Mostly cloudy. Slight chance of Sprinkles and drizzle through the night. Lows in the upper 40s. Northeast Winds 5 to 10 Mph. Chance of Showers 20 percent.

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Helena Temperature Statistics

September Temperature

Lone Rock Tri-County Regional Airport (8.7 miles)

  • Lowest 14 September, 2026

    42.7 °F

  • Average September

    69.1 °F

  • Highest 1 September, 2026

    89.7 °F

Climate (2021–2026)

Lone Rock Tri-County Regional Airport (8.7 miles)

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  • Average Low 2021–2026

    38.7 °F

  • Average 2021–2026

    49.6 °F

  • Average High 2021–2026

    60.4 °F
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