August Weather in Sines, Portugal

Last updated: August 27, 2025

In Sines, Portugal, the average temperature in August is a pleasant 21°C (71°F). You can expect daily temperatures to range from a minimum of 15°C (59°F) to a maximum of 38°C (101°F). With only 2 mm (0.1 in) of precipitation over 0 days, this month enjoys a relatively dry climate, complemented by an average humidity of 68%.

August Temperature in Sines

In August in Sines, the average temperature is 21°C (71°F). Maximum temperatures can reach 38°C (101°F), while minimums can drop to as low as 15°C (59°F). Overall, this makes Sines a warm and inviting destination, perfect for travelers seeking both comfort and adventure.

August Weather in Sines: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Sines, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sines, August typically has an average temperature of 21°C (71°F), with highs reaching up to 38°C (101°F) and lows dropping to around 15°C (59°F).

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

August Precipitation in Sines

In Sines in August, the precipitation amount is 2 mm (0.1 in) during a span of 0 days.

August Precipitation Trends in Sines

The chart displays monthly precipitation patterns in Sines, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Sines, August typically receives around 2 mm (0.1 inches) of precipitation spread over approximately 0 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

August Humidity in Sines

In Sines in August, humidity is 68%. With an average temperature of 21°C (71°F), this humidity feels like a warm embrace, making traveling a bit sticky but also inviting for leisurely strolls and outdoor adventures.

August Average Humidity in Sines

This chart illustrates the average monthly humidity levels in Sines, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Sines is approximately 68%, offering insight into how humid the weather typically is during this month.

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

August UV Index in Sines

In Sines in August, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Sines.

Maximum UV Index Levels in Sines for August

The chart shows the monthly maximum UV Index (UVI) for Sines in August, 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 August, the maximum UV index in Sines typically reaches 10, which falls under the very high exposure category.

Data source: Sines August 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 August Weather in Sines Compares to Other Months

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

This table compares monthly weather conditions in Sines, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	11°C (52°F)	31 mm (1.2 inches)	80%	moderate
February Weather	13°C (55°F)	55 mm (2.2 inches)	73%	moderate
March Weather	14°C (57°F)	82 mm (3.2 inches)	71%	high
April Weather	15°C (59°F)	70 mm (2.7 inches)	69%	very high
May Weather	18°C (65°F)	27 mm (1.1 inches)	69%	very high
June Weather	19°C (67°F)	9 mm (0.4 inches)	67%	extreme
July Weather	21°C (70°F)	3 mm (0.1 inches)	69%	very high
August Weather	21°C (71°F)	2 mm (0.1 inches)	68%	very high
September Weather	21°C (70°F)	13 mm (0.5 inches)	71%	very high
October Weather	18°C (65°F)	45 mm (1.8 inches)	75%	high
November Weather	15°C (59°F)	62 mm (2.4 inches)	78%	moderate
December Weather	13°C (55°F)	52 mm (2.0 inches)	81%	moderate