While temperatures can heat up over the summer, October weather offers a slight chill in the air and can sometimes be warm enough to take a dip in the Mediterranean Sea.
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Overall, October is not a great time for swimming. The water temperatures in Italy are getting too cold. However, if you are visiting the more Southern regions, you may find yourself having a nice sunny beach day at the beginning of the month!
The Mediterranean Sea Can Be Surprisingly Choppy Year RoundThe biggest offender is the Mediterranean, which tends to be roughest in the fall and winter, due to winds and storms. However, avid cruisers have experienced rough seas in the spring and summer, so be prepared for anything.
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.
In October the ocean temps can be quite warm BUT if there's a hurricane the ocean temp can drop by 10 degrees instantly. The mid/end of Sept. ocean temp w/out hurricanes is about 87 degrees. It starts to cool off and probably should be about 80 degrees in early/mid October, depending on hurricanes.
With average daily high temperatures in the mid-70s Fahrenheit, it's usually still warm enough in early October to sunbathe in comfort and to dine outside at night, with little chance of rain. By mid-October the Ionian and Aegean seas are cooling quickly; if you love to swim, go early in the month.
The warmest sea temperatures in October can be found in Hurghada, Egypt (28ºC), Cancun (27ºC), Dubai (27ºC), Dominican Republic (27ºC), Miami (27ºC), Phuket (27ºC) and Bali (27ºC). In Europe, the highest sea temperatures are in the Canary Islands (25ºC) and Cyprus (25ºC).
The Weather in OctoberRegardless, temperatures usually remain mild for the entire month, so a light waterproof jacket for the wet days and cooler nights should suffice. The water is still warm from the summer sun along the coast, so you will be able to enjoy swimming in the sea by boat or along the beach.
October is an excellent month for a holiday in Europe. It's still hot enough in the southern Mediterranean to bask in the sun, and the sea will be warm enough for swimming.
Many people consider September and October the best time to visit Mykonos because the August crowds are gone, the sea is still warm and perfect for swimming, and the island has a mellow, laid-back vibe as the tourist season starts winding down.