Crete is the warmest of the Greek islands in October because of its geographical location in the South Aegean Sea, close to North Africa.
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Kos. Due to its southerly location, Kos is consistently one of the hottest Greek islands. In October, the sea will be a pleasant 23ºC, with evening temperatures rarely falling below 15ºC. Only 4-5 days are likely to be affected by rain.
What are the hottest places in Europe in October? The warmest place in mainland Europe in October is Cyprus (26°C) followed by Malta (25ºC), Dalyan (25ºC) in southern Turkey and the Greek island of Kos (25ºC).
During October the average high temperature's 23ºC, which is perfectly warm enough to relax on the beach when the weather's clear. You should bring some warmer clothes for the evenings as things can get a bit chilly, while a waterproof jacket's also a good idea.
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.
Crete is a much more real and enjoyable place than Rhodes, which is pretty much given up to tourism. I'm afraid that also having visited both islands many times over the past 20 years, I'd have to say that Rhodes can offer just as much history as Crete, given it's smaller size.
There won't be any cooling rain showers: Crete has zero rain in July and August. This is one time of year when, contrary to what you might expect, Corfu is actually hotter than Crete. Daytime averages in both July and August are 32ºC, so expect some days to be much hotter.
October is when the tourist season starts to unwind, but many experts regard these last few weeks as the among the very best, and not just because the weather is starting to get miserable at home. In the Greek islands, the sun will almost certainly be shining all day and the sea will be deliciously warm for swimming.
The average temperature in Ibiza Town in October for a typical day ranges from a high of 73°F (23°C) to a low of 69°F (21°C). Some would describe it as pleasantly warm with a gentle breeze. For comparison, the hottest month in Ibiza Town, August, has days with highs of 81°F (27°C) and lows of 78°F (25°C).
With daily average temperatures ranging from 64°F (18°C) along the Dalmatian Coast to 54°F (12°C) inland in Zagreb, October makes for a pleasant time to participate in outdoor activities, like hiking or biking.