August weather forecast
Lisbon, Portugal

Riding the wave of summer, August in Lisbon continues with conditions similar to July. With the temperature reaching a peak of 28.3°C, 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

In Lisbon, the month of August registers the highest temperatures, averaging 28.3°C at the peak and 18.6°C at the lowest.

Rainfall

In August, the rain falls for 2 days. Throughout August, 6mm of precipitation is accumulated. Throughout the year, in Lisbon, there are 112 rainfall days, and 774mm of precipitation is accumulated.

Sea temperature

In Lisbon, the average seawater temperature in August is 19.6°C.
Note: For most people, a water temperature of 19.6°C is not conducive to enjoyable swimming. Breathing control becomes harder as the water temperature dips below 21°C.

Daylight

The average length of the day in August in Lisbon is 13h and 38min.
On the first day of August, sunrise is at 06:37 and sunset at 20:48. On the last day of the month, sunrise is at 07:04 and sunset at 20:09 WEST.

Sunshine

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

UV index

In Lisbon, the average daily maximum UV index in August is 8. A UV Index of 8 to 10 symbolizes a very high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: The daily high UV index of 8 in August translates into this advice:
Immediate precautions are necessary; otherwise, skin and eyes might get damaged quickly. Stay out of direct sunlight and seek shade between 10 a.m. and 4 p.m., when UV radiation is strongest, but remember that shade devices may not offer full sun protection. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized.