August weather forecast
Lisbon, Portugal

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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

Riding the wave of summer, August in Lisbon continues with conditions similar to July. With the temperature reaching a peak of 28.3°C (82.9°F), this is the only month to rival July in terms of warmth. The rain remains a scarce occurrence, and tourists can enjoy clear blue skies above. However, the UV index does drop slightly, offering a mild respite for those spending prolonged hours under the sun. Despite this, daytime temperatures remain high, promoting beach activities and water sports.

Temperature

Lisbon registers the highest average temperatures during the month of August, with peaks of 28.3°C (82.9°F) and lows of 18.6°C (65.5°F).

Rainfall

In August, the rain falls for 2 days. Throughout August, 6mm (0.24") of precipitation is accumulated. 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 is 19.6°C (67.3°F).
Note: 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).

Daylight

The average length of the day in August in Lisbon is 13h and 38min.
On the first day of the month, sunrise is at 06:38 and sunset at 20:47. On the last day of August, in Lisbon, Portugal, sunrise is at 07:05 and sunset at 20:08 WEST.

Sunshine

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

UV index

The average daily maximum UV index in August in Lisbon is 8. A UV Index estimate of 8 to 10 represents a very high health risk from unsafe exposure to UV radiation for the average person.
Note: A maximum high UV index of 8 in August translates into the following recommendations:
Stay protected; otherwise, skin and eyes can suffer rapid damage. Limit direct sun exposure especially between 10 a.m. and 4 p.m., when UV radiation is at its peak. However, keep in mind that shade structures may not provide full sun protection. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.

Frequently asked questions

What time of the year is the hottest in Lisbon?

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

Is it hot in Lisbon during August?

During August, Lisbon experiences an average high-temperature of 28.3°C (82.9°F) and a low-temperature of 18.6°C (65.5°F).

How many days does it rain in August in Lisbon?

In Lisbon, Portugal, in August, it is raining for 2 days, with typically 6mm (0.24") of accumulated precipitation.

What is the sea water temperature in August in Lisbon?

In Lisbon, in August, the average water temperature 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).

How many hours of daylight does Lisbon have in August?

The average day length in August in Lisbon, Portugal, is 13h and 38min.

When are sunrise and sunset in August in Lisbon?

In August, on the first day of the month, sunrise is at 06:38 and sunset at 20:47. On the last day of the month, in Lisbon, sunrise is at 07:05 and sunset at 20:08 WEST.

What are the months with the most sunshine in Lisbon?

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

How long on average sun shines in August in Lisbon?

The average sunshine duration in August is 11h.

What is the UV index reading in August in Lisbon?

The average daily maximum UV index in August in Lisbon, Portugal, is 8. A UV Index estimate of 8 to 10 represents a very high health threat from unsafe exposure to Sun's UV rays.
Average rainfall days
Average daylight
Average sunshine
Average UV index

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).

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).

Average rainfall days in August
Lisbon, Portugal

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

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

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).

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

Average daylight in August / Average sunshine in August - Lisbon, Portugal
  • Average daylight in August: 13h and 4min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in August: 11h

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

Average UV index in August
Lisbon, Portugal

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

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

Lisbon, Portugal

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