It's pretty mild at this time of year, but it's a good idea to bring along a jumper or light jacket for the evenings. The average daily maximum is 25 C and the average daily minimum is 20 C.
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Costa Del Sol has a mediterranean climate with hot dry summers and mild winters. If you're a sunseeker the best time to visit Costa Del Sol is between July and August. The hottest month of the year is July with an average daily maximum of 28 C and an average low of 22 C.
In October, the weather in Costa del Sol is generally pleasant, with average high temperatures ranging from 20°C to 25°C (68°F to 77°F). The sea temperature is relatively warm, making it possible to swim, although the water might feel cooler compared to the summer months.
Generally speaking, Portugal is cheaper than Spain, although the flight there will likely be the most expensive part of your Portugal vacation. A standard flight from North America to Lisbon in May will cost around $1,200 to $1,300CAD for a round trip.
Since Spain has a number of different climatic conditions, when you go will certainly influence the kind of holiday you have. Typically speaking, Spring (March to May) or Fall (September to November) are considered to be the best times to visit Spain.
While there are definitely far more beautiful places to see in Portugal, from Óbidos to the Berlengas Islands to Monsanto and beyond, there's no doubt that you can cover a bigger percentage of Portugal's top destinations in one trip than you can Spain's.