Fall in NiceAnd although you might not be able to enjoy a swim in the Mediterranean at this time of year, the water temperatures are still pretty comfortable for taking a dip, averaging around 68°F (20°C) in September and October.
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If you love swimming, the best time to go to Nice is in the summer, early autumn and late spring. The average sea temperature is a pleasant 23°C, which is perfect for a relaxing swim. You'll also have 14 hours of sunshine to enjoy per day from June to September and 11 hours a day throughout autumn.
Summer in NiceAverage temperatures in July and August hover around 80°F (27°C), with some days being even hotter. And if you want to enjoy a swim in the Mediterranean Sea, the water temperatures in Nice during the summer months are usually pretty balmy as well, averaging around 72°F (22°C).
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).
Most people prefer to swim when the air temperature is warm but not too hot, ideally between 70 and 80 degrees Fahrenheit (21 to 27 degrees Celsius). Extremely hot weather can cause dehydration and sunburn, while cooler weather can make it uncomfortable to be in and around the water.