September Weather in Vales do Rio, Portugal

Last updated: August 27, 2025

In September, the average temperature in Vales do Rio, Portugal hovers around 19°C (67°F), offering a pleasant climate for outdoor activities. You can expect a minimum of 7°C (45°F), while the mercury can rise to a maximum of 33°C (92°F) on warmer days. With an average humidity of 71%, it might feel a bit sticky at times. Be prepared for some rain, as the area typically receives 48 mm (1.9 in) of precipitation over about 5 days during the month. ☔️

September Temperature in Vales do Rio

In September in Vales do Rio, the average temperature is 19°C (67°F). The maximum can reach 33°C (92°F), while the minimum can drop as low as 7°C (45°F). This diverse range of temperatures makes Vales do Rio an ideal destination for travelers seeking both warmth and cooler respite throughout the month.

September Weather in Vales do Rio: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Vales do Rio, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Vales do Rio, September typically has an average temperature of 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 7°C (45°F).

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

September Precipitation in Vales do Rio

In Vales do Rio in September, the precipitation amount is 48 mm (1.9 in) spread over the course of 5 days.

September Precipitation Trends in Vales do Rio

The chart displays monthly precipitation patterns in Vales do Rio, 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 Vales do Rio, September typically receives around 48 mm (1.9 inches) of precipitation spread over approximately 5 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 Vales do Rio

In Vales do Rio 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 Vales do Rio

This chart illustrates the average monthly humidity levels in Vales do Rio, 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 Vales do Rio 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 Vales do Rio

In Vales do Rio 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 Vales do Rio.

Maximum UV Index Levels in Vales do Rio for September

The chart shows the monthly maximum UV Index (UVI) for Vales do Rio 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 Vales do Rio typically reaches 8, which falls under the very high exposure category.

Data source: Vales do Rio 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 Vales do Rio Compares to Other Months

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

This table compares monthly weather conditions in Vales do Rio, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	6°C (43°F)	57 mm (2.2 inches)	87%	moderate
February Weather	8°C (47°F)	93 mm (3.6 inches)	81%	moderate
March Weather	10°C (49°F)	124 mm (4.9 inches)	78%	high
April Weather	12°C (54°F)	121 mm (4.8 inches)	79%	very high
May Weather	16°C (61°F)	59 mm (2.3 inches)	78%	very high
June Weather	19°C (66°F)	37 mm (1.4 inches)	71%	extreme
July Weather	22°C (72°F)	13 mm (0.5 inches)	63%	very high
August Weather	22°C (72°F)	16 mm (0.6 inches)	64%	very high
September Weather	19°C (67°F)	48 mm (1.9 inches)	71%	very high
October Weather	15°C (60°F)	91 mm (3.6 inches)	79%	high
November Weather	10°C (49°F)	133 mm (5.2 inches)	86%	moderate
December Weather	8°C (46°F)	120 mm (4.7 inches)	87%	moderate