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Explore California

California offers divers a unique underwater experience, celebrated for its stunning cold-water diving opportunities. The state is renowned for its spectacular kelp forests, where sunlight streams through the swaying kelp, creating an ethereal, otherworldly atmosphere. These majestic underwater forests are home to an incredible array of marine life, including the playful sea lions, colorful nudibranchs, and the occasional majestic whale. Divers can explore a variety of environments, from vibrant reefs teeming with life to the eerie allure of Wreck Alley. Shore diving in Southern California is particularly popular, with easy access to diverse underwater landscapes. Meanwhile, boat dives and multi-day liveaboard trips offer the chance to discover more remote locations such as the Channel Islands and Catalina Island. Each site presents its own unique charm, whether it's the bustling marine reserves or the historic shipwrecks. Seasonal temperature variations mean divers should be prepared with appropriate gear, like a thick wetsuit or drysuit, especially during cooler months. Whether you're a seasoned diver or a curious beginner, California's dive sites promise a memorable adventure filled with diverse marine encounters and breathtaking natural beauty.

Top Regions to Explore

Upcoming Events

Enriched Nitrox Course ( up to 40%)

Enriched Nitrox Course ( up to 40%)

SSI Enriched Air Nitrox Diver CourseTake your diving to the next level with Enriched Air Nitrox (EAN)—one of the most valuable certifications a recreational diver can earn.Nitrox contains a higher percentage of oxygen than standard air, allowing for longer bottom times, reduced fatigue, and shorter surface intervals. It’s no surprise that divers have been safely using Nitrox since the late 1980s—and now it’s your turn to experience the benefits.Course OverviewThis entry-level specialty certification prepares you to safely plan and dive using Enriched Air Nitrox blends from EAN22 to EAN40.Upon successful completion, you will be certified to dive with Nitrox independently and may continue your training with the Advanced Nitrox Upgrade.What You’ll LearnHistory and evolution of Nitrox divingOxygen exposure and safety considerationsBenefits and limitations of EANGas handling and analysis proceduresDive planning using tables and computersEquipment considerations for Nitrox divingPhysics and physiology of enriched airScheduleLecture Session: Sept 23 6:00 PM – 8:00 PM(Please confirm if this date works for you.)Course RequirementsCompletion of course materialsWritten examNo dives required—this is a classroom-based certification.PricingCourse Fee: $125SSI Digital Learning Kit: $99 (Includes certification card; student discount available at $89.99)Optional Hard Card: $25Bundle & SaveEnroll in an Advanced Adventure / Advanced Course along with Nitrox and receive: ✔ $50 off the Advanced course ✔ One complimentary EAN cylinder rental ✔ Additional cylinders available at $20 eachTotal savings: $70Ready to Dive Smarter?Nitrox is one of the easiest ways to extend your dive time and improve your overall diving experience. Spots are limited—secure yours today!

High Sierra Divers, 217 Palm Ave, 95603, Auburn, CA, USA
October 21, 2026
$125.00

Dive Activity

Diving in California

California offers a diverse range of diving experiences that captivate dive travelers. Among the top dive sites are the Channel Islands, renowned for their vibrant kelp forests and abundant marine life. Wreck diving enthusiasts will find allure in the Yukon, an artificial reef off San Diego, providing a hauntingly beautiful underwater landscape. For shore dives, La Jolla Cove is a prime spot, offering easy access and the chance to spot playful sea lions and colorful Garibaldi fish. Unique underwater experiences abound in California, with night dives revealing the bioluminescence of plankton and the nocturnal activities of marine creatures. Dive travelers can enjoy a balance between shore diving options, like Monterey Bay's rich biodiversity, and liveaboard adventures to more remote locations like the Farallon Islands. Whether exploring sunken ships or admiring the coastal marine life, California's dive sites promise unforgettable underwater journeys.

Dive Centers

Dive Sites

The best Months to dive in California

California offers diverse diving conditions throughout the year, with opportunities available across various seasons. During the summer, water temperatures average around 17°C/63°F, leading to warmer and more comfortable dives. Winter temperatures drop to about 13°C/55°F, requiring thicker wetsuits or drysuits. Visibility can range from 3 to 30 meters/10 to 98 feet depending on location and conditions, with clearer waters often found in offshore sites.

Diving is possible year-round; however, certain factors can affect the experience. Winter months can bring stronger winds and currents, impacting surface conditions and visibility. Spring and fall are popular for their calmer seas and moderate temperatures. Overall, while diving is feasible at any time, divers should consider local weather patterns and coastal conditions when planning their trips for the best experience.

Top Wildlife Sightings in California

California's waters are teeming with marine life, making it a diver's paradise. Common reef fish include the bright orange Garibaldi and the colorful California sheephead, both easily spotted around kelp forests. These areas also host schools of blacksmith fish and opaleye, providing an animated underwater environment year-round.

Seasonal highlights in California include sightings of leopard sharks and bat rays, especially during the warmer months along sandy bottoms and coastal shallows. Sea turtles, though less common, can occasionally be encountered in Southern California waters, while hammerhead sharks make rare appearances in summer. Divers might also be lucky to spot the majestic giant sea bass, a notable species often seen near reefs and wrecks.

Wildlife Sightings are Based on User Generated Content

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 7

Sea Lion

Sea Lion

3.2k Sightings
J
121
F
163
M
236
A
252
M
305
J
326
J
368
A
384
S
377
O
306
N
233
D
164

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 300

Octopus

Octopus

1.2k Sightings
J
61
F
69
M
69
A
83
M
95
J
55
J
157
A
143
S
185
O
134
N
104
D
61

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 200

Moray Eel

Moray Eel

625 Sightings
J
11
F
22
M
34
A
28
M
45
J
52
J
101
A
121
S
66
O
65
N
46
D
34

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 600

Wrasse

Wrasse

279 Sightings
J
19
F
9
M
23
A
12
M
10
J
29
J
48
A
68
S
23
O
16
N
16
D
6
Green Turtle

Green Turtle

123 Sightings
J
7
F
15
M
12
A
6
M
13
J
16
J
16
A
11
S
6
O
6
N
8
D
7
Garibaldi Damselfish

Garibaldi Damselfish

4.8k Sightings
J
153
F
187
M
224
A
260
M
352
J
561
J
709
A
853
S
613
O
444
N
301
D
141

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 7000

Crab

Crab

4k Sightings
J
163
F
226
M
207
A
351
M
388
J
397
J
527
A
445
S
397
O
417
N
269
D
197

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 55

Lobster

Lobster

1.9k Sightings
J
100
F
86
M
138
A
90
M
111
J
187
J
226
A
229
S
222
O
287
N
145
D
45

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 60

Spiny Lobster

Spiny Lobster

1.8k Sightings
J
55
F
39
M
109
A
75
M
89
J
105
J
252
A
270
S
275
O
327
N
134
D
53

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 80

Stingrays

Stingrays

1.2k Sightings
J
48
F
91
M
62
A
69
M
92
J
94
J
166
A
130
S
130
O
121
N
81
D
77

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 3000

Nudibranch

Nudibranch

1.1k Sightings
J
40
F
85
M
63
A
112
M
126
J
95
J
141
A
129
S
98
O
117
N
85
D
55

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 250

Grouper/Basslets

Grouper/Basslets

1.1k Sightings
J
16
F
29
M
23
A
79
M
90
J
101
J
175
A
227
S
150
O
103
N
53
D
6

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 19

Seal

Seal

952 Sightings
J
51
F
34
M
87
A
66
M
62
J
91
J
94
A
121
S
120
O
109
N
72
D
45

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 35

Trout

Trout

685 Sightings
J
2
F
4
M
1
A
7
M
41
J
95
J
164
A
169
S
130
O
65
N
7
D
0

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 120

Flounder

Flounder

535 Sightings
J
15
F
45
M
15
A
13
M
33
J
58
J
98
A
87
S
60
O
50
N
42
D
19

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 19

Bass

Bass

533 Sightings
J
8
F
6
M
13
A
25
M
76
J
119
J
143
A
78
S
37
O
15
N
9
D
4
Sea Otter

Sea Otter

285 Sightings
J
17
F
17
M
43
A
62
M
21
J
32
J
16
A
23
S
34
O
7
N
11
D
2

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 3400

Shrimp

Shrimp

283 Sightings
J
1
F
1
M
8
A
16
M
27
J
24
J
51
A
27
S
45
O
48
N
31
D
4

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 130

Pipefish

Pipefish

230 Sightings
J
0
F
0
M
14
A
14
M
0
J
14
J
49
A
37
S
50
O
35
N
17
D
0

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 20

Guitarfish

Guitarfish

200 Sightings
J
1
F
4
M
11
A
24
M
26
J
16
J
31
A
48
S
15
O
22
N
2
D
0

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 100

Parrotfish

Parrotfish

157 Sightings
J
6
F
11
M
14
A
11
M
12
J
18
J
17
A
22
S
24
O
5
N
4
D
13

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 250

Scorpionfish

Scorpionfish

151 Sightings
J
11
F
4
M
3
A
17
M
7
J
5
J
5
A
19
S
33
O
21
N
14
D
12
Moon Jellyfish

Moon Jellyfish

150 Sightings
J
6
F
5
M
2
A
1
M
11
J
19
J
11
A
10
S
5
O
23
N
22
D
35

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 90

Angelfish

Angelfish

137 Sightings
J
5
F
10
M
9
A
10
M
21
J
15
J
7
A
10
S
16
O
10
N
7
D
17

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 130

Butterfly Fish

Butterfly Fish

123 Sightings
J
4
F
11
M
9
A
7
M
16
J
15
J
19
A
10
S
11
O
6
N
5
D
10

Curated by Interest

Events by Lifestyle Category

Underwater Beginner