September Weather in Ribeira Seca, Portugal

Last updated: August 27, 2025

In Ribeira Seca, Portugal, the average temperature in September is a pleasant 22°C (71°F), with temperatures ranging from a minimum of 17°C (64°F) to a maximum of 26°C (79°F). Expect about 67 mm (2.6 in) of precipitation spread over 16 days, contributing to an average humidity of 81%. Enjoy the mild climate while staying prepared for occasional rain!

September Temperature in Ribeira Seca

In September in Ribeira Seca, the average temperature is 22°C (71°F), with maximums reaching 26°C (79°F) and minimums dropping as low as 17°C (64°F). This mild weather makes Ribeira Seca an ideal destination for travelers looking to explore comfortably.

September Weather in Ribeira Seca: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Ribeira Seca, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ribeira Seca, September typically has an average temperature of 22°C (71°F), with highs reaching up to 26°C (79°F) and lows dropping to around 17°C (64°F).

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

September Precipitation in Ribeira Seca

In Ribeira Seca in September, the precipitation amount is 67 mm (2.6 in), spread over a duration of 16 days.

September Precipitation Trends in Ribeira Seca

The chart displays monthly precipitation patterns in Ribeira Seca, 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 Ribeira Seca, September typically receives around 67 mm (2.6 inches) of precipitation spread over approximately 16 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 Ribeira Seca

In Ribeira Seca in September humidity is 81%. With an average temperature of 22°C (71°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities somewhat challenging but offering a tropical ambiance perfect for exploring shaded areas and enjoying refreshing drinks.

September Average Humidity in Ribeira Seca

This chart illustrates the average monthly humidity levels in Ribeira Seca, 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 Ribeira Seca is approximately 81%, 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 Ribeira Seca

In Ribeira Seca in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Ribeira Seca.

Maximum UV Index Levels in Ribeira Seca for September

The chart shows the monthly maximum UV Index (UVI) for Ribeira Seca 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 Ribeira Seca typically reaches 9, which falls under the very high exposure category.

Data source: Ribeira Seca 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 Ribeira Seca Compares to Other Months

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

This table compares monthly weather conditions in Ribeira Seca, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	15°C (59°F)	73 mm (2.9 inches)	82%	moderate
February Weather	14°C (58°F)	98 mm (3.9 inches)	80%	moderate
March Weather	14°C (58°F)	65 mm (2.5 inches)	82%	high
April Weather	15°C (59°F)	87 mm (3.4 inches)	83%	very high
May Weather	17°C (62°F)	68 mm (2.7 inches)	81%	very high
June Weather	19°C (66°F)	44 mm (1.7 inches)	82%	extreme
July Weather	21°C (70°F)	23 mm (0.9 inches)	83%	very high
August Weather	22°C (72°F)	49 mm (1.9 inches)	81%	very high
September Weather	22°C (71°F)	67 mm (2.6 inches)	81%	very high
October Weather	20°C (68°F)	109 mm (4.3 inches)	79%	high
November Weather	17°C (64°F)	96 mm (3.8 inches)	79%	moderate
December Weather	16°C (61°F)	129 mm (5.1 inches)	84%	moderate