California's spiny lobster season opens in early October - and for a lot of us that's the highlight of the fall. With the opener now about two weeks out - it opens Friday, October 2 at 6 p.m. - and the water finally cooling into prime bug-diving range after the Marie swell, now is the time to get your gear, your paperwork, and your spots sorted. Here's the checklist.

If you dropped into Shaw's Cove this week and thought the bottom looked... different - lower, rockier, more reef than you remembered - you're not losing your mind. The big south swell that ran through over Labor Day did what big swells do: it grabbed the sand and moved it. Here's what happened, why it happens, and what it means the next time you gear up.

Over Labor Day weekend, the leftovers of Hurricane Marie threw a giant south swell at Southern California, and the whole coast felt it. The storm itself never came close - it stayed 700-plus miles to the south and west - but the long-period energy it fired off put High Surf and Coastal Flood advisories on the map through Tuesday, and set off a chain reaction that touched water temperature, visibility, the shape of our favorite coves, and even what showed up on the reef.

The thermometer just dropped, and if you dive San Diego you should be paying attention - because a cool-down like the one we just had is exactly the kind of switch that wakes up white seabass. After a summer of warm, lazy water, the ghosts of the kelp are back on the menu. Here's how to be ready.

It is Labor Day weekend, and the water is doing exactly what you would expect for early September - warm, blue offshore, and worth the effort if you pick your spot. The late-August blow that browned out the coast has settled down, the diving is coming back, and the warm water has the coast loaded with fish worth putting a shaft in. It is also one of the busiest boating weekends of the year, so staying visible and staying safe in heavy boat traffic needs to be front of mind. H

September is the month that usually rewards patience. The water stays warm, the crowds thin out after Labor Day, the wind lays down in the mornings, and the swell windows get longer. It is, in a lot of years, the single best diving month on the California calendar. Here is how the month is shaping up and where the opportunities are.

This is what actually happened in the water in August, region by region, grounded in dozens of in-water reports and the offshore intel that shaped the month.

You have probably seen the map going around, the one with the big orange arrows pushing warm water up the California coast and a bunch of sharks and sea snakes riding along with it. It looks dramatic, and honestly the basic idea is real. A strong El Nino warms up the eastern Pacific, and that warm water pulls a lot of southern species north with it. Some of that is great news for us as divers.

If you dive the Marine Room regularly, you already know the drill. Some mornings you wade in off the sand and can see clear across the flats. Other mornings you put your face in the water and can barely see your own hand. Same beach, same short walk from the car, completely different day. I get asked all the time whether the brown water is runoff, the tide, or the swell. At the Marine Room it is almost always the swell, and once you understand how it works you can tell what y

The tropics are awake. Tropical Storm Iselle, the first named eastern-Pacific storm to matter for us this season, is pushing a south swell toward Southern California mid-week. It is not a giant - the forecast is a modest mid-period pulse, roughly chest-to-head-high at exposed south-facing breaks, building Tuesday, peaking Wednesday, and easing Thursday - but even a modest south swell changes where and how you should dive.

A dive plan is only as good as the water you actually get into. Right now a handful of spots on the California coast are posted, closed, or worth a hard second look before you commit - and a couple of them are the kind of closure you do not want to push through. Here is a quick rundown of what to know this week, plus how to check for yourself before you make the drive.

A group member watching the pier cam this week sent in a fair question: 'Does anyone know why it's so particularly bad this week?' If you have been staring at green, stirred-up water and wondering what happened, you are not imagining it. The short version: this is not one problem, it is three late-summer factors stacking up at once - a lingering swell, a sudden upwelling flip, and the plankton bloom that upwelling feeds. Here is what is going on under that murk, and when it s

Rockfish are California's bread-and-butter reef catch. Here's how to identify the key species, hunt them effectively, and stay legal under the state's depth and seasonal rules.

Barred pargo are abundant, accessible, hard-fighting, and excellent on the table - but most traveling divers overlook them for flashier targets. Where they hold, how to hunt them, and why every Sea of Cortez diver should know this fish.

A boat anchor that drags during a dive ruins the day. A boat anchor that hooks rocks and refuses to come up ends the day. Here is the setup for each California bottom type.

If you tried to dive the Southern California coast in the last week of July, you already know: a run of big south swells stirred the bottom and blew the inshore visibility to pieces right when the summer bloom had finally started to settle. That's not bad luck — it's the season. Late summer is Eastern Pacific hurricane season, and distant tropical systems off Baja and mainland Mexico fire long-period south swells straight at our coast for weeks at a time. Here's the fix.

If you have spent any time diving the rocky reefs and kelp beds of California, you have almost certainly encountered a cabezon. With their massive heads, fleshy skin flaps, and mottled coloring that ranges from deep red to olive green, cabezon (Scorpaenichthys marmoratus) are not winning any beauty contests. But what they lack in looks, they more than make up for in table quality. Cabezon are one of the best-eating fish in California waters, with firm, sweet white meat that r

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.