Helena Weather Forecast

    • 64
    • 70

    Rain Showers

    • 48
    • 69

    Rain Showers

    • 40
    • 66

    Mostly Sunny

    • 47
    • 67

    Partly Sunny

    • 40
    • 70

    Mostly Sunny

    • 39
    • 64

    Mostly Sunny

    • 50
    • 67

    Partly Sunny

Today 30 Sep Iowa

Partly sunny. Highs around 70.

Tonight 30 Sep Iowa

Chance of light Showers and slight chance of Thunderstorms in the Evening, then Showers and slight chance of Thunderstorms in the late evening and overnight. Patchy fog through the night. Locally heavy rainfall possible after midnight. Lows in the lower 60s. Southwest Winds up to 10 Mph. Chance of precipitation near 100 percent.

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Helena Temperature Statistics

September Temperature

Lone Rock Tri-County Regional Airport (8.7 miles)

  • Lowest 23 September, 2026

    40.6 °F

  • Average September

    66 °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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