Daily averages in Porto in August are 68 F with highs of 77 F, and 75 F in Lisbon, with highs of 82 F. The Algarve coast is more sheltered, with average summer temperatures of 77 F and highs of 84 F.
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Algarve is the hottest region of Portugal, with the exception of Madeira Island (an archipelago of Portugal). In the Alentejo region the average temperatures are around 16ºC (depending on if you are on the coast or in the interior) and in the Algarve region 18ºC.
For the best weather, the general rule is to head south. The Algarve, in particular, is popular as it not only has some of the warmest temperatures in Portugal but some of the best beaches for enjoying that weather.
The warmest part of the Algarve is the eastern Algarve. The more west you travel, the colder and windier it usually gets, especially ones you go around the corner at Sagres. I would recommend staying anywhere in between the Spanish boarder and Salema.
Lisbon. A vibrant cosmopolitan city that combines its rich history with innovative modern design, Lisbon is an excellent place to visit at any time of year. ...
Lisbon's port remains one of the busiest cargo ports in Europe, and the breezes from this Atlantic gateway tend to temper the strong summer sun, with the average daily maximum temperature peaking at 29 °C in August.
This one is a close call with both destinations seeing temperatures sitting in the balmy mid- to late-twenties during the summer months. Out of the peak season, the Greek island of Crete warms up as early as May hitting around 25C, while the Algarve isn't far behind at around 22C.
The hottest places in EuropeThe hottest place in Europe is Valletta in Malta, with an average daily temperature over the whole year of 22.3ºC. A holiday in Malta is a pretty safe bet almost any time. Athens is second with an annual average of 22ºC. At 21.4ºC, Rome is in third place.
During the day, the land bordering the sea heats up, which means the air above the land is hotter than the air above the water. Since warm air above land expands and rises, the cooler, heavier air from the water rushes in to take its place. This creates wind.
Because Algarve, unlike Andalucia, is not in the Mediterranean sea: it's in the Atlantic Ocean. Furthermore, sea currents are really complex, so just because Atlantic Ocean may feel “warm” somewhere else, doesn't mean around Algarve it will be the same.
In the Algarve, the sea is typically warmer compared to the rest of Portugal, but even there, strong winds and currents bring cold water from deeper parts of the Ocean to the surface, resulting in cooler temperatures.
Yes, it's worth going to Portugal in winter. Portugal has a mild climate all year round, and during the winter, is still very sunny. During winter, you can enjoy Portugal's historic cities, gorgeous beaches, and charming towns without the crowds.
The Algarve will always have the best weather in November, with the majority of days dry and warm (reaching a maximum of 18C). The weather is not really hot enough for sunbathing or lounging by the pool, and you will need a jacket for the evenings.