August Weather in Lisbon, United States

Last updated: June 24, 2025

In August, the average temperature in Lisbon, United States hovers around 20°C (69°F), with a minimum of 7°C (45°F) and a maximum of 35°C (96°F). Expect a total precipitation of 108 mm (4.2 in) over approximately 9 days, and prepare for an average humidity level of 77%.

August Temperature in Lisbon

In August in Lisbon, the average temperature is 20°C (69°F). The maximum can reach 35°C (96°F), while the minimum can dip to as low as 7°C (45°F). Be prepared for warm days and cooler evenings during your travels!

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

The chart illustrates August temperature patterns in Lisbon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lisbon, August typically has an average temperature of 20°C (69°F), with highs reaching up to 35°C (96°F) and lows dropping to around 7°C (45°F).

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

August Precipitation in Lisbon

In Lisbon in August, the precipitation amount is 108 mm (4.2 in) spread over 9 days.

August Precipitation Trends in Lisbon

The chart displays monthly precipitation patterns in Lisbon, 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 Lisbon, August typically receives around 108 mm (4.2 inches) of precipitation spread over approximately 9 days.

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

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Millimeters (mm) Inches (in)

August Humidity in Lisbon

In Lisbon in August, humidity is 77%. With an average temperature of 20°C (69°F), this humidity feels like a sultry embrace, making travel comfortable yet slightly sticky, as the moist air clings to your skin with every step you take.

August Average Humidity in Lisbon

This chart illustrates the average monthly humidity levels in Lisbon, 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 Lisbon is approximately 77%, 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 Lisbon

In Lisbon in August, 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 Lisbon.

Maximum UV Index Levels in Lisbon for August

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

Data source: Lisbon 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 Lisbon Compares to Other Months

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

This table compares monthly weather conditions in Lisbon, 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 (13°F)	18 mm (0.7 inches)	87%	low
February Weather	-11°C (12°F)	20 mm (0.8 inches)	89%	moderate
March Weather	-2°C (29°F)	28 mm (1.1 inches)	82%	moderate
April Weather	4°C (40°F)	51 mm (2.0 inches)	79%	high
May Weather	14°C (57°F)	57 mm (2.3 inches)	74%	very high
June Weather	21°C (70°F)	79 mm (3.1 inches)	78%	very high
July Weather	23°C (73°F)	71 mm (2.8 inches)	76%	very high
August Weather	20°C (69°F)	108 mm (4.2 inches)	77%	very high
September Weather	16°C (61°F)	66 mm (2.6 inches)	72%	high
October Weather	7°C (45°F)	84 mm (3.3 inches)	74%	moderate
November Weather	-1°C (30°F)	16 mm (0.6 inches)	85%	moderate
December Weather	-7°C (20°F)	37 mm (1.5 inches)	84%	low