Last updated: August 27, 2025
In Sao Joao, Portugal, the average temperature in September is a pleasant 20°C (68°F). Expect a bit of variety, with temperatures dipping to a minimum of 9°C (49°F) and soaring to a maximum of 35°C (95°F). During this month, precipitation tends to amount to about 46 mm (1.8 in) over 6 days, while the atmosphere maintains a comfortable average humidity of 71%.
In September in Sao Joao, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F), while minimums can drop as low as 9°C (49°F). This variation in temperature makes it an ideal time for travelers to prepare for both warm days and cooler evenings.
In Sao Joao in September, the precipitation amount is 46 mm (1.8 in) over a span of 6 days.
In Sao Joao in September, humidity is 71%. With an average temperature of 20°C (68°F), this humidity feels like a warm, moist embrace that can quickly lead to discomfort for travelers. The air clings to your skin, making even short walks feel more strenuous, while reaching for a refreshing drink becomes essential to stay hydrated.
In Sao Joao 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 Joao.
UV Risk Categories
Weather in Sao Joao varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Sao Joao, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 9°C (48°F) | 88 mm (3.5 inches) | 87% | low |
| February Weather | 11°C (52°F) | 134 mm (5.3 inches) | 81% | moderate |
| March Weather | 12°C (54°F) | 141 mm (5.6 inches) | 78% | high |
| April Weather | 14°C (57°F) | 144 mm (5.7 inches) | 79% | very high |
| May Weather | 17°C (62°F) | 80 mm (3.1 inches) | 78% | very high |
| June Weather | 18°C (65°F) | 52 mm (2.0 inches) | 71% | extreme |
| July Weather | 20°C (69°F) | 21 mm (0.8 inches) | 63% | very high |
| August Weather | 21°C (69°F) | 18 mm (0.7 inches) | 64% | very high |
| September Weather | 20°C (68°F) | 46 mm (1.8 inches) | 71% | very high |
| October Weather | 16°C (62°F) | 113 mm (4.5 inches) | 79% | high |
| November Weather | 12°C (54°F) | 161 mm (6.4 inches) | 86% | moderate |
| December Weather | 10°C (51°F) | 187 mm (7.3 inches) | 87% | low |