Last updated: June 24, 2025
In September, the average temperature in Altona, United States hovers around 16°C (61°F). However, be prepared for a temperature range where it can dip to a brisk -2°C (28°F) at times, while occasionally soaring to a warm 32°C (90°F). During this month, expect about 75 mm (2.9 in) of precipitation spread over approximately 10 days, and maintain your comfort with an average humidity of 78%.
In September in Altona, the average temperature is 16°C (61°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop as low as -2°C (28°F). Overall, this time of year offers a diverse range of weather, so travelers should be prepared for both warm days and chilly nights.
In Altona in September, the precipitation amount is 75 mm (2.9 in) spread over a period of 10 days.
In Altona in September, humidity is 78%. With an average temperature of 16°C (61°F), this humidity feels like a warm, sticky embrace, making travel somewhat uncomfortable as it clings to your skin and creates a heavy atmosphere that can drain your energy.
In Altona in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Altona.
UV Risk Categories
Weather in Altona varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Altona, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -8°C (19°F) | 85 mm (3.3 inches) | 93% | low |
| February Weather | -6°C (21°F) | 87 mm (3.4 inches) | 92% | moderate |
| March Weather | -2°C (29°F) | 89 mm (3.5 inches) | 86% | moderate |
| April Weather | 6°C (42°F) | 119 mm (4.7 inches) | 85% | high |
| May Weather | 13°C (56°F) | 106 mm (4.2 inches) | 80% | very high |
| June Weather | 18°C (65°F) | 121 mm (4.7 inches) | 74% | very high |
| July Weather | 21°C (71°F) | 125 mm (4.9 inches) | 76% | very high |
| August Weather | 20°C (69°F) | 117 mm (4.6 inches) | 75% | very high |
| September Weather | 16°C (61°F) | 75 mm (2.9 inches) | 78% | high |
| October Weather | 9°C (49°F) | 143 mm (5.6 inches) | 86% | moderate |
| November Weather | 1°C (34°F) | 112 mm (4.4 inches) | 88% | moderate |
| December Weather | -4°C (25°F) | 82 mm (3.2 inches) | 89% | low |