During the Summer (June, July, August):It's summer and it's hot (not desert hot though…). Summer in Santorini is dry and hot. No long sleeves, no trousers, no jackets 24/7.
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Santorini Weather by Month. The best beach weather on Santorini is from June to September. July and August are the busiest months when hotels are full and restaurants are crowded. If you're more interested in sightseeing, hiking, and great views then March, April, May, October, and November are great months to visit.
July ushers in Santorini's finest weather of the year, and it's the ideal time to get down to one of the island's delightful beaches for a long sunbathe or a swim.
Generally, there is no dress code on the island unless you plan to visit specific restaurants, bars and clubs of high standards. When visiting churches and monasteries, you must be dressed appropriately, which means that beach-style appearances are not allowed.
Greece in July is invariably hot, averaging 81°F (27°C), in Athens, athough most of the islands can be a little cooler thanks to the sea breezes. The Meltemi winds blow over the Aegean island groups and help keep the Cyclades, especially, from being too hot. This is dry season, too, with little chance of rain.
The dress code in the Greek islands is generally casual and relaxed, although stylish. During the day, beachwear, shorts, T-shirts, and summer dresses are common. Evening attire can be a bit more elegant, with men wearing trousers and shirts and women donning summer dresses or similar.
Make sure to bring a light sweater or jacket to keep warm on the patio of the taverna as you enjoy your spanakopita. A packable rain jacket can also come in handy if there's a big downpour. If you like to wear shorts, throw in a comfortable pair along with one or two more warm-weather tops.
The Best Weather in GreeceJuly is when things get toasty and sometimes uncomfortably humid in Athens, and the city is crowded with tourists then, too. August, naturally, means great beach weather, and if you like your big cities to yourself then it's also a fine time for Athens, as most Athenians ditch the capital.