The weather is sunny and clear, and the sea is still warm enough for swimming. Avoiding the summer throng and enjoying the calmer side of Santorini is ideal in late September.
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The best time to visit Santorini is from September to October and April to May when the weather is warm and the crowds are scarce.
And, yes, you can also swim in Santorini in October. In fact, the sea is sometimes even warmer than in June! Plus, you get a little extra when visiting the island's shores as October is a low-tourism month. This means that you will probably have a large part of any beach all for yourself.
Santorini in September (85% Crowded): Hot and sunny but cooling a little from August. The weather is similar to June but the water temperature is warmer as it heats over the summer months. Winds have died down. September is the best month to visit Santorini.
September is the best month as the seawater has been warming up for some months under a blistering sun. I've often swum in the sea in Greece in early Sept. Remember the later in Sept, the more chance of the weather turning, so the earlier the better. Water temp can also vary according to where you are in Greece.
September is a great time to visit Greece. The weather remains hot throughout the month, sea temperatures stay warm, and visitors start to thin out as children go back to school.
Be warned that while early September will see all visitor facilities in full swing, but the latter part of the month may see hotels and restaurants reduce opening hours (or shut down completely).
Obviously, the weather will play a factor in what you're packing — but if you're going to Santorini from late spring to early fall, you should be fine with mainly “beachy” attire. Think sundresses, several bikinis, shorts, and cute tops, along with hats and sandals.
The average high in Santorini in October is 23oC, so it is still warm and lovely, even though you may need to pack a warmer jumper for after sunset. At night, the temps can drop to 16oC-18oC. Generally, though, October may be a cooler month than September but it's by far warmer than most European summer months.
Trousers & shorts: High-waisted shorts, culottes, and wide-leg pants should be on top of your list! Also, jeans are the safest option as they are always in fashion and go well with everything for a casual classy style. Sandals: Don't forget to bring with you a pair of flat sandals, ideal for both day and night.
Santorini is the top tourist destination in Greece and is world-famous for its unique natural beauty. The caldera with the white villages on top, the sunken volcano, and the charming sunset make it a popular place for vacation. In brief, we recommend staying 3 to 5 days in order to visit as many places as possible.
In the Greek islands, the sun will almost certainly be shining all day and the sea will be deliciously warm for swimming. In the southern islands, you can expect daily highs reaching 28ºC, falling to 24ºC towards the end of October.
The Greek islands are wonderful from late April to early November. For swimming, sun, and beach activities it's warmest from late May to early October.
GREECE. 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).