August is the warmest month of the year in California waters — and, in a normal year, the tail end of the peak plankton bloom. But 2026 has been anything but normal. After an early June bloom and a persistent marine heatwave that defined July, August arrives with the surface as warm as it will get all year and the coastal murk finally starting to ease.

If June 2026 was the month the bloom ambushed California six weeks early, July was the month divers learned to live with it. The plankton didn't vanish — but a persistent marine heatwave, a warm surface lens, and a reliable afternoon clearing pattern gave patient divers real windows. This is what actually happened in the water in July, region by region, grounded in dozens of in-water reports and the offshore intel that shaped the month.

Shore divers in California deal with surf zones every dive. Here is how to enter through breaking waves and exit without getting tumbled.

Between Big Sur and Santa Barbara lies a stretch of coast few divers explore - Cayucos, Morro Bay, Montana de Oro, and the reefs around Point Buchon. Here is what the SLO coast offers and how to dive it.

On the Central Coast, summer runs backward: cold, green, and calm, with shore visibility routinely 3 to 8 feet even on glassy days. Here is why upwelling and blooms flip the season, and how to dive around it.

Big surf from Baja hurricane swell doesn't always mean bad visibility — how swell period, spot exposure, and depth decide if the water still dives clean.

Essential spearfishing safety tips for San Diego — shallow water blackout and the buddy system, boat traffic, kelp entanglement, surf entries, and conditions.

Where to take a spearfishing class or safety course in San Diego — freediving and blackout-rescue training, plus online options to learn before you dive.