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August Weather in Lisbon, United States

Last updated: June 24, 2025

In August, the average temperature in Lisbon, United States is a comfortable 20°C (67°F). However, expect some variation, as temperatures can dip to a chilly 4°C (40°F) and soar up to a warm 34°C (93°F). Rainfall is also a factor, with 79 mm (3.1 in) of precipitation spread across 11 days, contributing to an average humidity level of 74%.

August Temperature in Lisbon

In August in Lisbon, the average temperature is 20°C (67°F), with maximums reaching 34°C (93°F) and minimums dropping as low as 4°C (40°F). This range makes Lisbon an ideal destination for travelers seeking pleasant weather and the versatility to enjoy both warm days and cooler evenings.

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 (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec192229425564696760483424
Data source: Temperature data for Lisbon generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Lisbon

In Lisbon in August, the total precipitation amount is 79 mm (3.1 in), falling over the course of 11 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 79 mm (3.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7675651099395110796312910084
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Lisbon

In Lisbon in August humidity is 74%. With an average temperature of 20°C (67°F), this humidity feels like a warm, tropical embrace that can make traveling feel a bit stifling, causing you to sweat and prompting frequent breaks in the shade to cool off.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%85%84%78%72%75%74%77%85%86%85%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910997532
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.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (19°F)76 mm (3.0 inches)91%low
February Weather-5°C (22°F)75 mm (3.0 inches)89%moderate
March Weather-1°C (30°F)65 mm (2.6 inches)85%moderate
April Weather6°C (43°F)109 mm (4.3 inches)84%very high
May Weather13°C (55°F)92 mm (3.6 inches)78%very high
June Weather18°C (64°F)95 mm (3.7 inches)72%very high
July Weather21°C (69°F)110 mm (4.3 inches)75%very high
August Weather20°C (67°F)79 mm (3.1 inches)74%very high
September Weather16°C (60°F)63 mm (2.5 inches)77%high
October Weather9°C (49°F)129 mm (5.1 inches)85%moderate
November Weather1°C (34°F)100 mm (3.9 inches)86%moderate
December Weather-4°C (24°F)84 mm (3.3 inches)85%low

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