August weather forecast
Lisbon, Portugal

The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle
The beautiful hillside city of Lisbon in Portugal, with a high, far view of the Sao Jorge Castle

Weather in August

August, the last month of the summer, in Lisbon, is another warm month, with average temperature varying between 28.3°C (82.9°F) and 18.6°C (65.5°F).

Temperature

The warmest month is August, with an average high-temperature of 28.3°C (82.9°F) and an average low-temperature of 18.6°C (65.5°F).

Rainfall

In Lisbon, Portugal, during August, the rain falls for 2 days and regularly aggregates up to 6.2mm (0.24") of precipitation. Throughout the year, in Lisbon, there are 112 rainfall days, and 774mm (30.47") of precipitation is accumulated.

Sea temperature

In August, the average sea temperature in Lisbon, Portugal, is 19.6°C (67.3°F).
Note: For most, swimming in 19.6°C (67.3°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

Daylight

The average length of the day in Lisbon is 13.6h.

Sunshine

July and August, with an average of 11h of sunshine, are months with the most sunshine.

UV index

In Lisbon, the average daily maximum UV index in August is 8. A UV Index reading of 8 to 10 represents a very high health vulnerability from the exposure to the Sun's UV radiation for the ordinary person.
Note: The average daily UV index of 8 in August transform into the following instructions:
Take special precautions, as unprotected eyes and skin can be burned and damaged quickly. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the warmest month in Lisbon?

With an average high-temperature of 28.3°C (82.9°F) and an average low-temperature of 18.6°C (65.5°F), August is the warmest month in Lisbon.

How many days does it rain in August in Lisbon?

In Lisbon, in August, during 2 rainfall days, 6.2mm (0.24") of precipitation is typically accumulated.

What is the sea temperature in August in Lisbon?

In Lisbon, Portugal, the average seawater temperature in August is 19.6°C (67.3°F). For swimming, a surface water temperature of 19.6°C (67.3°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

What is the average length of the day in August in Lisbon?

In Lisbon, the average length of the day in August is 13.6h.

What is the month with the most sunshine in Lisbon?

July and August, with an average of 11h of sunshine, are months with the most sunshine in Lisbon.

How many hours of sunshine does Lisbon have in August?

In Lisbon, Portugal, the average sunshine in August is 11h.

How high is the UV index in August in Lisbon?

In Lisbon, Portugal, the average daily maximum UV index in August is 8. A UV Index value of 8 to 10 symbolizes a very high health vulnerability from unprotected exposure to the UV radiation.

Average temperature in August
Lisbon, Portugal

Average temperature in August - Lisbon, Portugal
  • Average high temperature in August: 28.3°C

The warmest month (with the highest average high temperature) is August (28.3°C).
The month with the lowest average high temperature is January (14.8°C).

  • Average low temperature in August: 18.6°C

The month with the highest average low temperature is August (18.6°C).
The coldest month (with the lowest average low temperature) is January (8.3°C).

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Average rainfall in August
Lisbon, Portugal

Average rainfall in August - Lisbon, Portugal
  • Average rainfall in August: 6.2mm

The wettest month (with the highest rainfall) is November (127.6mm).
The driest month (with the least rainfall) is July (4.2mm).

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Average rainfall days in August
Lisbon, Portugal

Average rainfall days in August - Lisbon, Portugal
  • Average rainfall days in August: 2 days

Months with the highest number of rainy days are January, February and December (14 days).
Months with the least rainy days are July and August (2 days).

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Average sea temperature in August
Lisbon, Portugal

Average sea temperature in August - Lisbon, Portugal
  • Average sea temperature in August: 19.6°C

The best month for swimming (with the highest average sea temperature) is September (19.9°C).
The coldest month (with the lowest average sea temperature) is March (15.1°C).

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Average daylight in August /
Average sunshine in August
Lisbon, Portugal

Average daylight in August / Average sunshine in August - Lisbon, Portugal
  • Average daylight in August: 13.6h

The month with the longest days is June (Average daylight: 14.8h).
The month with the shortest days is December (Average daylight: 9.5h).

  • Average sunshine in August: 11h

Months with the most sunshine are July and August (Average sunshine: 11h).
Months with the least sunshine are January, February, November and December (Average sunshine: 5).

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Average UV index in August
Lisbon, Portugal

Average UV index in August - Lisbon, Portugal
  • Average UV index in August: 8

Months with the highest UV index are June and July (UV index 9).
Months with the lowest UV index are January and December (UV index 2).

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