September weather forecast
Portugal

September in Portugal marks the transition from summer to autumn, characterized by gradually decreasing temperatures and slightly increased rainfall. The average temperature across the country is around 22°C (71.6°F) during this month. Coastal cities like Lisbon and Porto provide milder weather conditions with Lisbon seeing temperatures from 17°C (62.6°F) to 27°C (80.6°F), and Porto experiencing temperatures between 14°C (57.2°F) and 23°C (73.4°F).

Precipitation in September begins to increase compared to the dry summer months, with Lisbon receiving an average of about 30mm (1.18") and Porto seeing a bit more at approximately 70mm (2.76"). Given the mild weather, snowfall in northern high-altitude areas, such as Serra da Estrela, remains highly unlikely.

Compared to the preceding month, August, September experiences a decrease in temperature and a slight increase in rainfall, signaling the beginning of the transition into the cooler autumn months. Looking to the following month, October, September is generally warmer and drier. The gentle shift in climate makes September a pleasant month for exploration and outdoor activities, as visitors can still enjoy the tail-end of the warm summer weather along with the onset of autumn's scenic beauty.

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• Lisbon - September »
  September is the month with the warmest seawater in Lisbon, with an average sea temperature of 19.9°C (67.8°F). September is the month with the warmest seawater in Lisbon, with an average sea temperature of 19.9°C (67.8°F).
• Porto - September »
  With an average sea temperature of 18.2°C (64.8°F), September is the month with the warmest seawater in Porto, Portugal. September is the month with the warmest seawater in Porto, with an average sea temperature of 18.2°C (64.8°F).
• Faro - September »
  On the last day of September, in Faro, sunrise is at 07:26 and sunset at 19:16 WEST. In Faro the average seawater temperature in September is 21.6°C (70.9°F).
• Coimbra - September »
  Embracing the arrival of autumn, September brings a subtle decrease in temperature, making the days and nights in Coimbra more comfortable. On the first day of September in Coimbra, sunrise is at 07:01 and sunset at 20:05.
• Braga - September »
  In Braga, in September, during 7.4 rainfall days, 35mm (1.38") of precipitation is typically accumulated. In Braga, in September, during 7.4 rainfall days, 35mm (1.38") of precipitation is typically accumulated.
• Aveiro - September »
  In September, in Aveiro the rain falls for 5.8 days. The least humid month in Aveiro is September, with an average relative humidity of 70%.
• Evora - September »
  On the last day of September, in Evora, sunrise is at 07:27 and sunset at 19:15 WEST. In Evora, during September, the rain falls for 5 days and regularly aggregates up to 32mm (1.26") of precipitation.
• Viseu - September »
  In Viseu, Portugal, in September, during 6.2 rainfall days, 21mm (0.83") of precipitation is typically accumulated. Viseu in September undergoes a slight reduction in the average high-temperature, shifting from August's warm 29.6°C (85.3°F) to a still moderately hot 26.5°C (79.7°F).
• Funchal - September »
  With an average sea temperature of 23.8°C (74.8°F), September is the month with the warmest seawater in Funchal, Portugal. With an average sea temperature of 23.8°C (74.8°F), September is the month with the warmest seawater in Funchal.
• Guarda - September »
  In Guarda in September, it is raining for 5.9 days, with typically 19mm (0.75") of accumulated precipitation. The commencement of September in Guarda, Portugal, indicates a gentle shift in the average high-temperature, receding from August's 29.2°C (84.6°F) to a still moderately hot 25.3°C (77.5°F).
• Beja - September »
  In Beja, Portugal, in September, it is raining for 3.3 days, with typically 5mm (0.2") of accumulated precipitation. As daylight gradually diminishes to 12.4 hours, September paints a mosaic of warm and cool shades in Beja's weather impressions.