September Weather in Foz do Sousa, Portugal

Last updated: August 27, 2025

The average temperature in Foz do Sousa, Portugal during September hovers around 20°C (68°F). Expect a minimum of 10°C (50°F) and a maximum of 34°C (93°F), creating a pleasant range for outdoor activities. During this time, anticipate about 45 mm (1.8 in) of precipitation spread over 6 days, contributing to the region's lush scenery. With an average humidity of 71%, the air feels comfortably fresh and invigorating.

September Temperature in Foz do Sousa

In September in Foz do Sousa, the average temperature is 20°C (68°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 10°C (50°F). This pleasant climate makes Foz do Sousa an ideal destination for travelers looking to enjoy a comfortable and diverse range of outdoor activities.

September Weather in Foz do Sousa: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Foz do Sousa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Foz do Sousa, September typically has an average temperature of 20°C (68°F), with highs reaching up to 34°C (93°F) and lows dropping to around 10°C (50°F).

Data source: Temperature data for Foz do Sousa generated using information from the Copernicus Climate Change Service.

September Precipitation in Foz do Sousa

In Foz do Sousa in September, the precipitation amount is 45 mm (1.8 in) over the course of 6 days.

September Precipitation Trends in Foz do Sousa

The chart displays monthly precipitation patterns in Foz do Sousa, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Foz do Sousa, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 6 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

September Humidity in Foz do Sousa

In Foz do Sousa 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.

September Average Humidity in Foz do Sousa

This chart illustrates the average monthly humidity levels in Foz do Sousa, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Foz do Sousa is approximately 71%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Foz do Sousa

In Foz do Sousa 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 Foz do Sousa.

Maximum UV Index Levels in Foz do Sousa for September

The chart shows the monthly maximum UV Index (UVI) for Foz do Sousa in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Foz do Sousa typically reaches 8, which falls under the very high exposure category.

Data source: Foz do Sousa September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Foz do Sousa Compares to Other Months

Weather in Foz do Sousa varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Foz do Sousa, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Foz do Sousa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	9°C (48°F)	90 mm (3.5 inches)	87%	low
February Weather	11°C (52°F)	138 mm (5.4 inches)	81%	moderate
March Weather	12°C (53°F)	144 mm (5.7 inches)	78%	high
April Weather	14°C (57°F)	154 mm (6.1 inches)	79%	very high
May Weather	17°C (62°F)	84 mm (3.3 inches)	78%	very high
June Weather	18°C (65°F)	55 mm (2.1 inches)	71%	extreme
July Weather	20°C (69°F)	24 mm (1.0 inches)	63%	very high
August Weather	21°C (69°F)	19 mm (0.7 inches)	64%	very high
September Weather	20°C (68°F)	45 mm (1.8 inches)	71%	very high
October Weather	16°C (62°F)	120 mm (4.7 inches)	79%	high
November Weather	12°C (54°F)	164 mm (6.5 inches)	86%	moderate
December Weather	11°C (51°F)	194 mm (7.6 inches)	87%	low