To reduce your risk, don't swim too far from shore, stay in groups, avoid being in the water during darkness or twilight, don't go in the water if you are bleeding from a wound, leave shiny jewelry at home, and avoid brightly colored swimwear.
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July is when disease outbreaks most likely to occur in lakes and oceans.
Read the beach safety signs at the entrance to the beach. Once on the beach, look for beach warning flags, often posted on or near a lifeguard's stand. A green flag means water conditions are safe and other colors mean conditions are not safe. These flags are there to protect you.
Many beaches are closed to swimmers because they aren't safe—steep ocean floor drop-offs close to shore create strong waves and undercurrents, making it dangerous to enter the water. These beaches are clearly marked with red flags, warning swimmers to stay away.
The average temperature in Europe is 21.8°C. The highest current temperature on the continent according to our data, is in Koper (Slovenia) where water has 28.9 degrees celsius. On the other hand the lowest temperature is in Dalatangi (Iceland) where water has 12.1 degrees celsius.