Greece is home to some of the best swimming waters in all of Europe, and September is a great month to visit, with the weather and sea temperatures as perfect as can be (26.8°C/80.2°F).
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Warmest sea temperatures in SeptemberThe hottest temperatures are found in the eastern and southernmost parts of the Mediterranean – Cyprus averages 27°C and Malta 26°C.
On a countrywide level, Spain's weather in October is mild and pleasant, with average temperature ranges of about 55 to 75°F (12-23°C). The north is getting colder and rainier, while the south is still mostly warm and dry.
Andalucia consistently ranks as the hottest place in Spain in October. It's warm enough to rent a villa with private pool and you'll find rates are considerably lower than in summer – just make sure there's a terrace where you can sit outside and barbecue dinner.
It will still be plenty warm for swimming in the south of the country, though the north starts to become a bit more dicey. However, it's perfect hiking weather everywhere! Another positive of traveling to Spain in September is that there are a host of local festivals and holidays on the calendar.
Portugal's beaches are beautiful, yes–but due to being set on the Atlantic, the water is actually much colder than many visitors might expect (yes, even in the Algarve). What is this? Spain's long Mediterranean coast, on the other hand, tends to offer much warmer water and a longer swimming season.