September Weather in Arcos, Portugal

Last updated: August 27, 2025

In September, the average temperature in Arcos, Portugal hovers around 19°C (67°F). You'll experience a comfortable climate, with minimums dipping to 11°C (51°F) and peaks reaching up to 30°C (87°F). Prepare for approximately 39 mm (1.5 in) of precipitation over about 6 days, and enjoy an average humidity of 71% for that fresh, invigorating feel!

September Temperature in Arcos

In September, in Arcos, the average temperature is 19°C (67°F). The maximum can reach 30°C (87°F) and the minimum can be as low as 11°C (51°F). It's a great time to visit for pleasant weather and enjoyable outdoor activities.

September Weather in Arcos: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Arcos, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arcos, September typically has an average temperature of 19°C (67°F), with highs reaching up to 30°C (87°F) and lows dropping to around 11°C (51°F).

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

September Precipitation in Arcos

In Arcos in September, the precipitation amount is 39 mm (1.5 in), occurring over the course of 6 days.

September Precipitation Trends in Arcos

The chart displays monthly precipitation patterns in Arcos, 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 Arcos, September typically receives around 39 mm (1.5 inches) of precipitation spread over approximately 6 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Arcos

In Arcos in September, humidity is 71%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel pleasant yet slightly sticky, as the air clings gently to your skin and invites you to stay hydrated while exploring.

September Average Humidity in Arcos

This chart illustrates the average monthly humidity levels in Arcos, 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 Arcos 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 Arcos

In Arcos in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Arcos.

Maximum UV Index Levels in Arcos for September

The chart shows the monthly maximum UV Index (UVI) for Arcos 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 Arcos typically reaches 7, which falls under the high exposure category.

Data source: Arcos 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 Arcos Compares to Other Months

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

This table compares monthly weather conditions in Arcos, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	10°C (50°F)	103 mm (4.0 inches)	87%	low
February Weather	11°C (53°F)	142 mm (5.6 inches)	81%	moderate
March Weather	12°C (54°F)	150 mm (5.9 inches)	78%	high
April Weather	14°C (57°F)	147 mm (5.8 inches)	79%	very high
May Weather	16°C (62°F)	85 mm (3.4 inches)	78%	very high
June Weather	18°C (64°F)	44 mm (1.7 inches)	71%	very high
July Weather	20°C (68°F)	19 mm (0.7 inches)	63%	very high
August Weather	20°C (68°F)	21 mm (0.8 inches)	64%	very high
September Weather	19°C (67°F)	39 mm (1.5 inches)	71%	high
October Weather	16°C (62°F)	131 mm (5.2 inches)	79%	high
November Weather	13°C (56°F)	175 mm (6.9 inches)	86%	moderate
December Weather	12°C (53°F)	190 mm (7.5 inches)	87%	low