August Weather in Lisbon, United States

Last updated: June 24, 2025

In August, the average temperature in Lisbon, United States is a pleasant 21°C (70°F). Expect minimums dipping to 11°C (51°F) and maximums reaching up to 33°C (91°F). With an average precipitation of 77 mm (3.0 in) over 9 days, and a humidity level of 66%, it's a month where you can enjoy both warm days and refreshing breezes.

August Temperature in Lisbon

In August in Lisbon, the average temperature is 21°C (70°F), with maximums reaching 33°C (91°F) and minimums dipping to as low as 11°C (51°F). This pleasant climate makes it an ideal time for travelers to explore the beauty of Lisbon.

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 21°C (70°F), with highs reaching up to 33°C (91°F) and lows dropping to around 11°C (51°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 77 mm (3.0 in) over the course of 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 77 mm (3.0 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 66%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making it comfortable for leisurely strolls but slightly sticky for longer excursions.

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 66%, 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	-4°C (25°F)	83 mm (3.3 inches)	86%	low
February Weather	-3°C (27°F)	87 mm (3.4 inches)	84%	moderate
March Weather	0°C (33°F)	73 mm (2.9 inches)	82%	moderate
April Weather	7°C (44°F)	118 mm (4.7 inches)	80%	high
May Weather	12°C (55°F)	78 mm (3.1 inches)	72%	very high
June Weather	18°C (65°F)	66 mm (2.6 inches)	72%	very high
July Weather	21°C (70°F)	117 mm (4.6 inches)	67%	very high
August Weather	21°C (70°F)	77 mm (3.0 inches)	66%	very high
September Weather	17°C (63°F)	70 mm (2.8 inches)	71%	high
October Weather	11°C (53°F)	131 mm (5.1 inches)	78%	moderate
November Weather	4°C (39°F)	114 mm (4.5 inches)	84%	moderate
December Weather	-2°C (29°F)	120 mm (4.7 inches)	81%	low