Last updated: August 28, 2025
In September, the average temperature in San Jose de Mayo, Uruguay is a comfortable 14°C (58°F). Expect a range that dips to a chilly 2°C (37°F) at night and peaks at a warm 30°C (86°F) during the day. Be prepared for some rain, with an average precipitation of 83 mm (3.3 in) spread across 7 days. The humidity sits at a notable 76%, adding a bit of moisture to the air.
In September in San Jose de Mayo, the average temperature is 14°C (58°F), with maximums potentially reaching 30°C (86°F) and minimums dropping as low as 2°C (37°F). This variation makes it a great time to explore, but be sure to pack layers for changing conditions.
In San Jose de Mayo in September, the total precipitation amount is 83 mm (3.3 in) over the course of 7 days.
In San Jose de Mayo in September humidity is 76%. With an average temperature of 14°C (58°F), this humidity feels like a warm, thick blanket wrapping around you, making outdoor activities feel sticky and draining, and prompting travelers to seek shade and stay hydrated often.
In San Jose de Mayo 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 Jose de Mayo.
UV Risk Categories
Weather in San Jose de Mayo varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in San Jose de Mayo, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 24°C (75°F) | 78 mm (3.1 inches) | 63% | extreme |
| February Weather | 23°C (73°F) | 100 mm (3.9 inches) | 69% | extreme |
| March Weather | 21°C (70°F) | 89 mm (3.5 inches) | 73% | extreme |
| April Weather | 18°C (65°F) | 72 mm (2.8 inches) | 79% | high |
| May Weather | 14°C (58°F) | 109 mm (4.3 inches) | 82% | moderate |
| June Weather | 12°C (54°F) | 94 mm (3.7 inches) | 80% | moderate |
| July Weather | 11°C (52°F) | 89 mm (3.5 inches) | 72% | moderate |
| August Weather | 12°C (54°F) | 81 mm (3.2 inches) | 72% | high |
| September Weather | 14°C (58°F) | 83 mm (3.3 inches) | 76% | very high |
| October Weather | 16°C (62°F) | 91 mm (3.6 inches) | 71% | extreme |
| November Weather | 20°C (68°F) | 66 mm (2.6 inches) | 68% | extreme |
| December Weather | 22°C (72°F) | 60 mm (2.3 inches) | 65% | extreme |