Last updated: August 28, 2025
In September, the average temperature in San Carlos, Uruguay hovers around 13°C (57°F), offering a pleasant climate for outdoor activities. You'll experience a range of temperatures, with minimums dipping to 3°C (38°F) and maximums soaring to 28°C (82°F). However, be prepared for some moisture, as precipitation averages 85 mm (3.3 in) over the course of 7 days, contributing to an average humidity of 76%.
In September in San Carlos, the average temperature is 13°C (57°F). The maximum can reach 28°C (82°F), while the minimum can drop as low as 3°C (38°F). This makes it an ideal time for travelers to enjoy a variety of outdoor activities while being prepared for both warm and cool weather.
In San Carlos in September, the total precipitation amount is 85 mm (3.3 in) over the course of 7 days.
In San Carlos in September humidity is 76%. With an average temperature of 13°C (57°F), this humidity feels like a damp chill wrapping around you, making travel uncomfortable and prompting a constant need for a light jacket as you navigate through the misty atmosphere.
In San Carlos in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in San Carlos.
UV Risk Categories
Weather in San Carlos varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Carlos, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 23°C (73°F) | 77 mm (3.0 inches) | 63% | extreme |
| February Weather | 22°C (72°F) | 100 mm (3.9 inches) | 69% | extreme |
| March Weather | 20°C (69°F) | 66 mm (2.6 inches) | 73% | extreme |
| April Weather | 18°C (65°F) | 89 mm (3.5 inches) | 79% | high |
| May Weather | 15°C (59°F) | 78 mm (3.1 inches) | 82% | moderate |
| June Weather | 12°C (54°F) | 120 mm (4.7 inches) | 80% | moderate |
| July Weather | 11°C (52°F) | 105 mm (4.2 inches) | 72% | moderate |
| August Weather | 12°C (54°F) | 97 mm (3.8 inches) | 72% | high |
| September Weather | 13°C (57°F) | 85 mm (3.3 inches) | 76% | very high |
| October Weather | 15°C (60°F) | 94 mm (3.7 inches) | 71% | extreme |
| November Weather | 18°C (65°F) | 62 mm (2.4 inches) | 68% | extreme |
| December Weather | 21°C (69°F) | 60 mm (2.4 inches) | 65% | extreme |