Makos and Blue sharks are more common through spring months, and Silkies usually enjoy the warmer summer water. Hammerheads are common from April to June. If you're interested in Bull sharks, they've been seen in recent years at the Cabo Pulmo Marine Reserve from December to August.
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The season runs from June through September. This is when the sharks are abundant in waters around Cancun, Isla Mujeres, Isla Contoy, and Isla Holbox. The peak months are July and August.
Whale sharks are frequently seen in the plankton-rich waters of the Mexican Caribbean between May and September. The legal season for swimming with whale sharks is June 15 – September 15.
Warning! While at Lover's Beach do not attempt to wade or swim on the neighboring Pacific Ocean side, called Divorce beach, as strong and dangerous under toes are prevalent and very dangerous. Medano Beach is the safest swimming beach in Cabo San Lucas in the middle of downtown and all the major happenings.
Swimming in Cabo San LucasBe sure to look for a green flag on the beach that indicates the area is approved for swimming. If you aren't sure if a beach is safe or not, avoid it or consult a local. Cabo San Lucas is a beautiful place to swim and snorkel, and there are plenty of beaches where you can do so safely.
Cabo beaches that are known to be swimmable include Medano Beach, Palmilla Beach, and Chileno Beach. Look for colored flags. Cabo has a beach color-coding system that lets you know the level of safety onsite. Black flags indicate the most dangerous conditions.
The commission is happy to report that at least 10 Cabo beaches boast optimal water quality and are set to receive tourists that will make their way to the Mexican Pacific during the summer break. Their research includes monitoring the levels of Enterococcus, and E Coli bacteria in the water close to the shore.
Because there are a number of places around Cabo where strong undertows, unpredictable tides, and hardy waves make for less than ideal swimming conditions, these places have been red flagged around the community as the Cabo San Lucas beaches you wouldn't want to visit if you're looking to frolic in the water.
Don't drink the waterIt is not recommended to drink unfiltered tap water in Cabo San Lucas. Just to be safe, ask for bottled water and be wary of drinks with ice cubes.