United States · Eastern Pacific
Best time to dive Channel Islands (California)
Diveable year-round; best in late summer and autumn, with visibility peaking September–November (up to ~25 m in the southern islands). Giant sea bass gather to spawn June–September and are seen less predictably the rest of the year. Winter storms bring big swell. 'Coral' here scores kelp-forest health.
Peak season: June–October
Overall diving, month by month
Balanced scoring · forecasts include the 2026/27 El Niño outlook
Confidence: Nov medium · Dec medium · Jan medium · Feb medium · Mar medium · Apr medium · May medium · Jun low · Jul medium · Aug medium · Sep medium · Oct low · Nov low · Dec low
What's good when
Each attribute scored 0–10 for every month
| Nov2026 | Dec | Jan2027 | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pelagic & big animals | 6 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 7 | 7 | 7 | 6 | 6 | 5 |
| Macro life | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| Coral & reef health | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Visibility | 7 | 5 | 5 | 5 | 5 | 5 | 5 | 6 | 6 | 6 | 7 | 7 | 7 | 5 |
| Water temperature | 3 | 2 | 2 | 1 | 1 | 1 | 2 | 3 | 3 | 4 | 3 | 3 | 2 | 1 |
| Weather & sea state | 7 | 5 | 4 | 4 | 5 | 6 | 7 | 7 | 8 | 8 | 8 | 8 | 7 | 6 |
| Operations & access | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
Climate outlook
How this year's forecast differs from a typical year
- Water temperature +1.8 °C · El Niño warms Southern California waters (Nov 2026 – December 2027)
- Coral & reef health -1.6 · Warm, nutrient-poor water and storm swell thin the kelp forest (Nov 2026 – December 2027)
- Weather & sea state -1 · El Niño winters bring bigger storm swells to the coast (Dec 2026 – March 2027)
Water temperature & visibility
| Month | Water | Visibility |
|---|---|---|
| November 2026 | 18.5 °C (65 °F) | 15–25 m |
| December 2026 | 17.3 °C (63 °F) | 10–15 m |
| January 2027 | 16.3 °C (61 °F) | 8–15 m |
| February 2027 | 16.2 °C (61 °F) | 8–15 m |
| March 2027 | 15.9 °C (61 °F) | 8–15 m |
| April 2027 | 16.1 °C (61 °F) | 8–15 m |
| May 2027 | 16.7 °C (62 °F) | 8–15 m |
| June 2027 | 17.9 °C (64 °F) | 10–20 m |
| July 2027 | 19.1 °C (66 °F) | 10–20 m |
| August 2027 | 20.0 °C (68 °F) | 12–20 m |
| September 2027 | 19.9 °C (68 °F) | 15–25 m |
| October 2027 | 18.7 °C (66 °F) | 15–25 m |
| November 2027 | 16.7 °C (62 °F) | 15–25 m |
| December 2027 | 15.1 °C (59 °F) | 10–15 m |
Marine life calendar
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| california sea lion | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● |
| garibaldi | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● |
| giant sea bass | ● | ● | ● | ● | ● | Peak | Peak | Peak | Peak | ● | ● | ● |
Peak = best odds · ● = regularly seen · blank = unlikely. Calendar months, every year.
About the diving
- Difficulty
- Intermediate
- Current strength
- 3 / 5
- Luxury level
- 4 / 5
- Typical depth
- 5–30 m
- Max depth of interest
- 40 m
- Dive styles
- Liveaboard, Day boat, Shore
- Suggested certification
- Open Water + cold-water experience
- Nearest airport
- LAX
- Snorkelling
- Good
- Known for
- california sea lion, garibaldi, giant sea bass, giant kelp forest
Famous sites: Anacapa Arch · Santa Barbara Island · Casino Point · Painted Cave
Season notes & sources
- Diveable year-round; best in late summer and autumn, with visibility peaking September–November (up to ~25 m in the southern islands). Giant sea bass gather to spawn June–September and are seen less predictably the rest of the year. Winter storms bring big swell. 'Coral' here scores kelp-forest health.
- The 1997–98 El Niño caused widespread giant-kelp losses along the North American west coast through warm, nutrient-poor water and large waves.
Sources
- Channel Islands National Park submerged resources (National Park Service)
- Diving in Southern California (Bluewater Dive Travel)
- Giant sea bass (Aquarium of the Pacific)
- Diving with giant black seabass in Southern California (California Diver)
- Catastrophe, recovery and range limitation of NE Pacific kelp forests (USGS)