Last updated: August 27, 2025
In September, the average temperature in Castro Daire, Portugal hovers around 18°C (65°F), creating a pleasant atmosphere for outdoor activities. Expect temperatures to range from a cool 7°C (44°F) to a warm 32°C (90°F), so be prepared for fluctuations. With an average precipitation of 51 mm (2.0 in) over approximately 7 days, a light raincoat might come in handy. Additionally, the air will feel quite humid, with an average humidity level of 71%—perfect for a refreshing coastal breeze!
In September in Castro Daire, the average temperature is 18°C (65°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as 7°C (44°F). This pleasant range makes Castro Daire an inviting destination for travelers seeking a comfortable climate.
In Castro Daire in September, the precipitation amount is 51 mm (2.0 in) over a period of 7 days.
In Castro Daire in September humidity is 71%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making it a bit sticky and muggy, which can be slightly uncomfortable for traveling, especially if you're engaging in outdoor activities or exploring the city on foot.
In Castro Daire 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 Castro Daire.
UV Risk Categories
Weather in Castro Daire varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Castro Daire, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | 6°C (43°F) | 84 mm (3.3 inches) | 87% | moderate |
| February Weather | 8°C (47°F) | 137 mm (5.4 inches) | 81% | moderate |
| March Weather | 10°C (49°F) | 153 mm (6.0 inches) | 78% | high |
| April Weather | 12°C (53°F) | 153 mm (6.0 inches) | 79% | very high |
| May Weather | 15°C (59°F) | 76 mm (3.0 inches) | 78% | very high |
| June Weather | 17°C (63°F) | 57 mm (2.3 inches) | 71% | extreme |
| July Weather | 20°C (68°F) | 27 mm (1.1 inches) | 63% | very high |
| August Weather | 20°C (68°F) | 22 mm (0.9 inches) | 64% | very high |
| September Weather | 18°C (65°F) | 51 mm (2.0 inches) | 71% | very high |
| October Weather | 14°C (58°F) | 108 mm (4.3 inches) | 79% | high |
| November Weather | 9°C (49°F) | 151 mm (5.9 inches) | 86% | moderate |
| December Weather | 8°C (46°F) | 182 mm (7.2 inches) | 87% | low |