NOAA says that while there's no optimal water temperature, most people feel most comfortable swimming in water between 70 and 78 degrees. Based on those average temperatures, October could be ideal for these comfortable water temps.
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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.
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).
According to the National Center for Cold Water Safety, water temperatures below 70 degrees Fahrenheit should be treated with caution. Water temperatures between 50 and 60 degrees Fahrenheit makes it difficult to control your breathing, and anything lower than 40 degrees is painfully cold.
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.
According to the National Center for Cold Water Safety, water temperatures below 70 degrees Fahrenheit should be treated with caution. Water temperatures between 50 and 60 degrees Fahrenheit makes it difficult to control your breathing, and anything lower than 40 degrees is painfully cold.
Now, southern Spain, which includes all of Andalusia and parts of southern Castilla La Mancha, Extremadura, Murcia, and parts of the Valencia region, has almost perfect weather in October. Daily temperatures range from about 58 to 79°F (15-25°C), with the occasional break into the 80s.
The sea temperature is still warm in October and most days are sunny. Most businesses are open, despite the fewer crowds and, sure enough, you can find great deals in this off-season. The best time to visit Mykonos is October when the crowds have diminished, the water remains warm and rates fall.
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.
Sand and surf aren't just for summer fun.Just because summer is over doesn't mean you need to stop hitting the beach! A fall beach trip has many upsides—less crowds, fewer sunburns, off-season deals, the list goes on! Sure, you may need a light jacket in the evening, but there's still so much to enjoy.
Lanzarote, Gran Canaria and Fuerteventura are equally hot in October, all with daytime temperatures averaging in the mid-20s. The sea remains warm enough for swimming, so it's a great time of year for both sunbathing and sightseeing.
Canary islandsIf heat and sun are what you're after, then you'll want to head to the island of Tenerife in October. Tenerife is the hottest of all the Canary Islands in October, reaching average maximum temperatures of 26°C.
The weather in the Canary Islands in October sees warm temperatures and bright skies across Fuerteventura, Lanzarote, Gran Canaria, Tenerife and La Palma. The average for these islands is 19°C, with warmer islands like the south of Lanzarote around 24°C.