September Weather in Relva, Portugal

Last updated: August 27, 2025

In September, the average temperature in Relva, Portugal is a pleasant 22°C (71°F), with minimums dipping to 19°C (66°F) and maximums reaching 24°C (76°F). Expect some rain, as 66 mm (2.6 in) of precipitation typically falls over 12 days. The air feels quite humid, with an average humidity of 81%, making it a cozy and refreshing time to visit!

September Temperature in Relva

In September in Relva, the average temperature is 22°C (71°F). Maximum temperatures can reach 24°C (76°F), while minimums can drop to as low as 19°C (66°F). This pleasant climate makes Relva an ideal destination for travelers looking to enjoy mild weather and outdoor activities.

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

The chart illustrates September temperature patterns in Relva, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Relva, September typically has an average temperature of 22°C (71°F), with highs reaching up to 24°C (76°F) and lows dropping to around 19°C (66°F).

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

September Precipitation in Relva

In Relva in September, the precipitation amount is 66 mm (2.6 in) over the course of 12 days.

September Precipitation Trends in Relva

The chart displays monthly precipitation patterns in Relva, 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 Relva, September typically receives around 66 mm (2.6 inches) of precipitation spread over approximately 12 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 Relva

In Relva 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 Relva

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

In Relva 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 Relva.

Maximum UV Index Levels in Relva for September

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

Data source: Relva 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 Relva Compares to Other Months

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

This table compares monthly weather conditions in Relva, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	16°C (61°F)	77 mm (3.0 inches)	82%	moderate
February Weather	15°C (59°F)	111 mm (4.4 inches)	80%	moderate
March Weather	15°C (59°F)	66 mm (2.6 inches)	82%	high
April Weather	15°C (60°F)	88 mm (3.5 inches)	83%	very high
May Weather	17°C (62°F)	71 mm (2.8 inches)	81%	very high
June Weather	19°C (66°F)	39 mm (1.5 inches)	82%	extreme
July Weather	21°C (69°F)	18 mm (0.7 inches)	83%	very high
August Weather	22°C (72°F)	49 mm (1.9 inches)	81%	very high
September Weather	22°C (71°F)	66 mm (2.6 inches)	81%	very high
October Weather	20°C (69°F)	123 mm (4.8 inches)	79%	high
November Weather	18°C (65°F)	105 mm (4.2 inches)	79%	moderate
December Weather	17°C (63°F)	141 mm (5.6 inches)	84%	moderate