Last updated: August 27, 2025
In September, the average temperature in Sao Brissos, Portugal hovers around 23°C (74°F), providing a pleasant climate for outdoor activities. However, temperatures can swing from a cool 10°C (51°F) to a sizzling 38°C (101°F), so be prepared for anything! During this month, you can expect approximately 14 mm (0.6 in) of rainfall spread over 1 day, while the average humidity sits at a comfortable 71%.
In September in Sao Brissos, the average temperature is a pleasant 23°C (74°F). The maximum can reach a sweltering 38°C (101°F), while the minimum can dip to a cool 10°C (51°F). This diverse range of temperatures makes it essential for travelers to pack both light clothing for the daytime heat and layers for the cooler evenings.
In Sao Brissos in September, the precipitation amount is 14 mm (0.6 in) over the course of 1 day.
In Sao Brissos in September, humidity is 71%. With an average temperature of 23°C (74°F), this humidity feels like a warm, enveloping embrace that can make outdoor activities feel sticky, but if you're well-hydrated and take breaks in the shade, it offers a pleasant tropical ambiance perfect for exploration.
In Sao Brissos in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sao Brissos.
UV Risk Categories
Weather in Sao Brissos varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sao Brissos, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 9°C (49°F) | 25 mm (1.0 inches) | 80% | moderate |
| February Weather | 12°C (54°F) | 42 mm (1.7 inches) | 73% | moderate |
| March Weather | 13°C (56°F) | 75 mm (3.0 inches) | 71% | high |
| April Weather | 15°C (60°F) | 56 mm (2.2 inches) | 69% | very high |
| May Weather | 20°C (68°F) | 27 mm (1.1 inches) | 69% | very high |
| June Weather | 22°C (71°F) | 9 mm (0.4 inches) | 67% | extreme |
| July Weather | 24°C (75°F) | 2 mm (0.1 inches) | 69% | extreme |
| August Weather | 25°C (77°F) | 1 mm (0.0 inches) | 68% | very high |
| September Weather | 23°C (74°F) | 14 mm (0.6 inches) | 71% | very high |
| October Weather | 19°C (67°F) | 43 mm (1.7 inches) | 75% | high |
| November Weather | 14°C (57°F) | 49 mm (1.9 inches) | 78% | moderate |
| December Weather | 12°C (53°F) | 44 mm (1.8 inches) | 81% | moderate |