Altona Weather Forecast

    • 55
    • 78

    Slight Chance Thunderstorms

    • 56
    • 76

    Chance Rain Showers

    • 53
    • 67

    Chance Rain Showers

    • 52
    • 73

    Chance Rain Showers

    • 54
    • 81

    Partly Sunny

    • 56
    • 80

    Partly Sunny

Today 22 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Slight chance of Showers early in the afternoon. Slight chance of Thunderstorms late in the afternoon. Highs near 80. Chance of rain 20 percent.

Tonight 22 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy with a slight chance of Thunderstorms in the Evening, then mostly cloudy after midnight. Lows 50 to 56. Chance of precipitation 10 percent.

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Altona Temperature Statistics

September Temperature

Vance Brand Airport (6.2 miles)

  • Lowest 20 September, 2026

    47.8 °F

  • Average September

    69.1 °F

  • Highest 13 September, 2026

    93.4 °F

Climate (2021–2026)

Vance Brand Airport (6.2 miles)

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  • Average Low 2021–2026

    38.5 °F

  • Average 2021–2026

    53.4 °F

  • Average High 2021–2026

    68.8 °F
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