If you visit San Carlos in July or August, you quickly learn the rhythm of the Sonoran Desert summer: you wake up early, dive the morning glassy seas, and by 1:00 PM, you are seeking the sanctuary of shade, air conditioning, and an ice-cold beverage. The midday heat is intense.
But when the sun finally dips behind the jagged silhouette of Tetakawi Hill, the entire environment breathes a sigh of relief. The desert air cools, the sky turns into a canopy of brilliant stars, and the ocean invites you back for the best dive of the day. For local pros and seasoned visitors alike, July and August are the undisputed champion months for Night Diving.
If you have never giant-strided into the Sea of Cortez in the dark, here is why a summer night dive is the ultimate underwater escape.
The Perfect Climate Combo: Warm Water, Cool Air
The biggest hurdle for many divers considering a night dive is the fear of being cold. In the winter, surfacing from a night dive into a chilly, breezy boat ride can be daunting. Summer eliminates this problem completely.
In July and August, the water temperature in the Sea of Cortez peaks, often sitting comfortably between 82°F and 86°F (28°C – 30°C). You can comfortably dive at midnight in just a 3mm wetsuit, a rash guard, or even a swimsuit. Entering the water feels like sinking into a massive, dark, perfectly heated swimming pool.
Even better, when your dive is over, you aren’t rushing for a towel. The night air is beautifully balmy. You can stand on the beach or the boat deck, gaze up at the Milky Way, and enjoy the perfect ambient temperature. It is the most physically comfortable diving experience of the year.
The “Vampires” of the Reef Emerge
When the sun sets, the daytime cast of characters goes to sleep. The colorful wrasses and angelfish tuck themselves into the rocks. This quiet transition allows the nocturnal predators—the true oddballs of the ocean—to take over.
- The Octopus Show: This is the headline act. Summer nights are prime time for watching the California Two-Spot Octopus hunt. By day, they are hidden deep in the rocks; by night, they stride boldly across the sand and reef, shifting colors and textures in the blink of an eye as they search for crabs.
- Crustacean Takeover: The reef suddenly looks like it’s crawling. Spiny lobsters leave their deep crevices to march across the open bottom, while hermit crabs, decorator crabs, and tiny cleaner shrimp become hyper-active in your flashlight beam.
- Predators on the Prowl: You will see moray eels completely out of their holes, free-swimming like snakes. Scorpionfish sit motionless in the open, waiting to ambush careless prey.
The Magic of Summer Bioluminescence
Summer brings massive plankton blooms to the Sea of Cortez. While this might lower your daytime visibility, it creates pure magic at night. Much of this plankton is bioluminescent.
Halfway through your dive, your guide will signal for everyone to kneel on the sand, cover their flashlights, and wait for their eyes to adjust. When you wave your hands through the pitch-black water, you will trigger thousands of tiny, glowing blue-green sparks. It looks like you are casting spells underwater. In July and August, this “Avatar” effect is often at its absolute brightest.
Easy Access: Window Rock After Dark
You don’t need a long boat ride to experience this. Our favorite summer night dives happen right from the shore. Sites like Window Rock are absolutely perfect for this.
The entry is easy, the navigation is simple, and the maximum depth is shallow (usually around 30 to 40 feet). Because you are shallow and moving slowly to look for macro critters, a single tank can easily last an hour. You get a massive amount of bottom time to simply float in the warm water and explore.
Get Certified for the Dark
Night diving is spectacular, but it does require a slightly different skill set. You need to know how to communicate with a flashlight, how to manage a backup light, and how to maintain your buoyancy when you can’t see the surface or the bottom.
Summer is the ideal time to earn your SSI Night Diving and Limited Visibility specialty. We can knock out the training dives during the warm, comfortable summer evenings, giving you a certification that will open up a whole new world of diving for the rest of your life.
Don’t let the summer heat keep you out of the water. Contact Dive San Carlos today to book your July or August night dives and see the Sea of Cortez in a whole new light!