Last updated: August 27, 2025
In September, the average temperature in Sao Martinho do Porto, Portugal hovers around 19°C (67°F). Expect minimums of 14°C (58°F) and maximums peaking at 30°C (86°F). With an average humidity of 67%, you'll feel the warmth and moisture in the air. Over the course of the month, anticipate around 24 mm (1.0 in) of precipitation across just 3 days.
In September in Sao Martinho do Porto, the average temperature is 19°C (67°F). The maximum can reach 30°C (86°F) and the minimum can be as low as 14°C (58°F). This moderate climate makes it a perfect time for outdoor activities and exploring the local sights.
In Sao Martinho do Porto in September, the total precipitation amount is 24 mm (1.0 in) accumulated over a period of 3 days.
In Sao Martinho do Porto in September, humidity is 67%. With an average temperature of 19°C (67°F), this humidity feels like walking through a warm, soft blanket, making sightseeing and outdoor activities a bit more challenging but still enjoyable for those prepared with light clothing and plenty of hydration.
In Sao Martinho do Porto 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 Sao Martinho do Porto.
UV Risk Categories
Weather in Sao Martinho do Porto varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sao Martinho do Porto, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 12°C (54°F) | 50 mm (2.0 inches) | 85% | moderate |
| February Weather | 13°C (56°F) | 55 mm (2.1 inches) | 75% | moderate |
| March Weather | 13°C (57°F) | 73 mm (2.9 inches) | 72% | high |
| April Weather | 15°C (59°F) | 80 mm (3.1 inches) | 70% | very high |
| May Weather | 17°C (63°F) | 39 mm (1.5 inches) | 70% | very high |
| June Weather | 18°C (65°F) | 24 mm (1.0 inches) | 63% | extreme |
| July Weather | 19°C (67°F) | 12 mm (0.5 inches) | 60% | very high |
| August Weather | 20°C (68°F) | 7 mm (0.3 inches) | 60% | very high |
| September Weather | 19°C (67°F) | 24 mm (1.0 inches) | 67% | very high |
| October Weather | 18°C (64°F) | 69 mm (2.7 inches) | 74% | high |
| November Weather | 15°C (59°F) | 91 mm (3.6 inches) | 83% | moderate |
| December Weather | 13°C (56°F) | 73 mm (2.9 inches) | 85% | moderate |