Altona Weather Forecast

    • 58
    • 83

    Mostly Sunny

    • 55
    • 81

    Mostly Sunny

    • 60
    • 89

    Mostly Sunny

    • 57
    • 89

    Partly Sunny

    • 57
    • 80

    Chance Thunderstorms

    • 55
    • 81

    Chance Thunderstorms

Today 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Partly cloudy. Slight chance of Thunderstorms early in the afternoon. Chance of Thunderstorms late in the afternoon. Highs in the 80s. Chance of precipitation 30 percent.

Tonight 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County

Mostly clear. Slight chance of Thunderstorms in the evening. Lows 53 to 61. Chance of precipitation 10 percent.

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Altona Temperature Statistics

September Temperature

Vance Brand Airport (6.2 miles)

  • Lowest 4 September, 2026

    50 °F

  • Average September

    73.3 °F

  • Highest 4 September, 2026

    93.2 °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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