Altona Weather Forecast
- 55
- 84
Slight Chance Thunderstorms
- 53
- 83
Chance Thunderstorms
- 56
- 84
Slight Chance Thunderstorms
- 55
- 81
Chance Thunderstorms
- 50
- 77
Chance Thunderstorms
- 49
- 75
Chance Thunderstorms
Today 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County
Partly cloudy until late Afternoon, then mostly cloudy with a slight chance of Thunderstorms late in the afternoon. Some Thunderstorms may produce gusty Winds late in the afternoon. Highs in the mid to upper 80s. Chance of precipitation 20 percent.
Tonight 8 Sep Boulder And Jefferson Counties Below 6000 Feet/West Broomfield County
Partly cloudy. Slight chance of Thunderstorms in the evening. Some Thunderstorms may produce gusty Winds in the evening. Lows in the 50s. Chance of precipitation 20 percent.
Altona Temperature Statistics
September Temperature
Vance Brand Airport (6.2 miles)
Lowest 6 September, 2025
43.7 °FAverage September
67.8 °FHighest 3 September, 2025
90 °F
Climate (2020–Present)
Vance Brand Airport (6.2 miles)
Average Low 2020–2025
37.7 °FAverage 2020–2025
52.4 °FAverage High 2020–2025
67.8 °F