Mildest of all is the Algarve in the country's south, with an average temperature of 61°F (16°C) and highs of 73°F (23°C) – warm enough for T-shirts but not for swimming in the sea just yet.
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If you're a surfer, April is also a good time to travel as the weather is nice and there are usually pretty good waves. Also, you won't find too many people in April. No big crowds or package holiday travellers. All together this makes April one of my favorite months to travel to the Algarve.
Spain will be warming up nicely in April, if you pick the right spot. It's not a great time to visit the north coast and Madrid will be just 18ºC with a strong chance of rain showers. But head south and you can expect 25ºC in Seville and other parts of Andalucia with eight hours of daily sunshine.
Low season months of November to March are a cheaper time to visit. If you want to escape the crowds and enjoy rock-bottom prices on accommodations, plan your trip for the low season. Many museums and other attractions keep shorter hours, though you'll still find a full lineup of performances in cities and bigger towns ...
The Algarve is a popular destination for expats and tourists alike, so it can be more costly than other areas in Portugal, especially compared to the north of the country. Overall, however, you will find that prices are more reasonable than in other regions of western Europe.
Here, cozy sweaters, waterproofs, and warm layers come into play. Spring and fall offer milder temperatures, yet packing might require a mix of both light and warm clothes. Linen, Birkenstocks, and Raybans are my go-to outfit in Portugal, even in October.
April is a bit of a shoulder month between the 'winter' weather (which is already very mild in the Algarve) and the warm summer weather. So quite frankly, it's impossible to predict in advance what kind of weather you'll get in April. Most likely, it will be nice and sunny with daytime temperatures around 20°C (68°F).
If, however, you want to go swimming and sunbathing every day, and enjoy nightlife and other touristy activities, then it's best to come between May and September – October. April weather is perfect for exploring the coastline of Algarve, but not always warm enough for sunbathing and beaches.
The Canary Islands (23ºC) are the hottest places in Europe in April with Gran Canaria (24ºC) and Tenerife (23ºC) feeling a little warmer than Lanzarote (22ºC). In Mainland Europe the warmest places in April are Cyprus (22ºC) and Crete (20°C).
April to May and September to October are the best times for perfect weather. In central Spain and on the Mediterranean coast, the spring and autumn seasons are marked by sunlit days and pleasant weather perfect for strolling and outdoor dining in terrazas, with temperatures cooling down by nightfall.