Daytime high temperatures tend to be around 17-18 C (62-64 F) early in the month, warming to about 19-20 C (66-68 F) near the end of the month. A few of the warmer afternoons, especially near the end of this month can reach up near 24 C (75 F).
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The hottest place is Portugal in March is the island of Madeira (20ºC) while on the mainland the hottest places are the Algarve (19ºC) and the Alentejo (19ºC).
The best time to visit Portugal is in spring (March-May), when the country is in bloom and waking after the winter. You could also go in fall (between September and October) when the sun is still shining, the weather is warm, and many of the crowds have dispersed.
During March, you will see about 15 mostly sunny, 3 partly sunny, and 13 mostly cloudy days. Rain normally falls on 11-15 days this month, however, only 5-6 days record 1 mm (0.04 inches) or more with only 1-2 days seeing rainfalls of 10 mm (0.40 inches) or more.
It's still too cold for sunbathing and swimming (the Atlantic needs time to warm up) in the Algarve and on the west coast, but some impressive swells (not to mention cheaper, more abundant accommodation) make this a good month for surfing in resort towns like Sagres, Ericeira, and Peniche.
The Canary Islands is the warmest place in Europe in March. So, all you need is a light jacket for the windy evenings. Where to stay in the Canary islands in March? Lanzarote is the top island of choice for most.
The beach season in Lisbon, Portugal is from June to September, during which the capital city is hot, but the temperatures on the beaches by the coast are much cooler and more enjoyable thanks to the nice sea breezes blowing in from the Atlantic.
So, how many days to explore Lisbon? We always recommend that it takes three days to fully explore Lisbon. This is sufficient to visit all of the characterful districts, experience the nightlife and join a couple of unique activities.
In Lisbon rainiest months of the year are December and November during which monthly rainfall average reaches 128 mm. On the other side, driest months are August and July when the average rainfall is reduced to 4 mm per month.
Portugal has a mediterranean climate with hot dry summers and mild winters. If you enjoy hot perfect sunny days the best time to visit Portugal is between June and August. The hottest month of the year is July with an average daily maximum of 30 C and an average low of 22 C.