Last updated: August 22, 2025
In September, the average temperature in Puerto Williams, Chile hovers around 3°C (38°F). Expect chilly days, with minimums reaching -12°C (11°F) and maximums peaking at 15°C (59°F). During this month, 62 mm (2.4 in) of precipitation typically falls over approximately 15 days, and the average humidity remains high at 84%. Dress warmly and be prepared for wet conditions!
In September in Puerto Williams, the average temperature is 3°C (38°F). Maximums can reach 15°C (59°F), while minimums can drop to as low as -12°C (11°F). Travelers should be prepared for chilly weather and a significant temperature range when visiting during this time.
In Puerto Williams in September, the precipitation amount is 62 mm (2.4 in) over the course of 15 days.
In Puerto Williams in September, humidity is 84%. With an average temperature of 3°C (38°F), this humidity feels like a damp chill that seeps into your bones, making traveling uncomfortable as the cold air clings to you and the moisture creates an oppressive heaviness in the atmosphere.
In Puerto Williams in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Puerto Williams.
UV Risk Categories
Weather in Puerto Williams varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Puerto Williams, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 9°C (48°F) | 120 mm (4.7 inches) | 83% | very high |
| February Weather | 9°C (49°F) | 106 mm (4.2 inches) | 85% | very high |
| March Weather | 8°C (46°F) | 97 mm (3.8 inches) | 85% | high |
| April Weather | 6°C (42°F) | 70 mm (2.8 inches) | 86% | moderate |
| May Weather | 4°C (39°F) | 65 mm (2.5 inches) | 86% | low |
| June Weather | 1°C (33°F) | 48 mm (1.9 inches) | 86% | low |
| July Weather | 1°C (33°F) | 38 mm (1.5 inches) | 85% | low |
| August Weather | 2°C (35°F) | 65 mm (2.6 inches) | 85% | moderate |
| September Weather | 3°C (38°F) | 62 mm (2.4 inches) | 84% | moderate |
| October Weather | 5°C (41°F) | 72 mm (2.8 inches) | 83% | very high |
| November Weather | 7°C (46°F) | 93 mm (3.7 inches) | 84% | extreme |
| December Weather | 9°C (48°F) | 103 mm (4.0 inches) | 82% | extreme |