Kerama Islands Diving: Water Temperature and Visibility Guide
The Kerama Islands in Okinawa are renowned for exceptional diving conditions year-round. Visibility often ranges from 20 to 40 meters, allowing divers to fully appreciate the vibrant coral reefs and abundant marine life.
Water temperatures vary seasonally:
- Spring (April–June): 22–26°C – calm seas and moderate crowds, ideal for beginners and underwater photography.
- Summer (July–September): 27–30°C – peak season with vivid tropical fish and active turtles.
- Autumn (October–November): 24–27°C – excellent visibility and fewer divers, perfect for serene exploration.
- Winter (December–March): 19–22°C – cooler, quieter, and peaceful dives, offering clear views of coral formations and reef landscapes.
Understanding these conditions helps divers plan their trip to make the most of their Kerama diving experience.
January - March
January to March, the water temperature is around 22°C. This is the coldest period of the year around Okinawa and the Kerama Islands. Guests typically wear thick wetsuits with inner layers for warmth.
April
From late April, the water temperature rises to around 23°C around the Kerama Islands. Guests still wear thick wetsuits with inner layers to stay warm.
May
In May, the water temperature ranges from about 22°C to 23°C, and by late May it can reach around 24°C in the Kerama Islands area. From this period onward, both the water and air temperatures start to become warmer.
June
In June, the water temperature rises quickly toward the latter half of the month around the Kerama Islands. In early June, it is around 24°C, but by the second half it typically reaches about 27–28°C. Once the rainy season ends in June, Okinawa enters summer and the weather becomes much more stable.
July - August
From July to August, the summer water temperature is stable at around 27–29°C in the Kerama Islands area. A 3mm wetsuit or spring suit is usually enough for this season.When a typhoon passes, the water temperature may drop slightly to around 27°C.
September - October
Around September, it is still summer, and the water temperature remains about 27–29°C in the Kerama Islands area. In October, the water temperature gradually starts to drop and is typically around 27°C.
November
Around November, the water temperature is about 26°C in the Kerama Islands area. From this period, it starts to feel a bit cooler, so most divers wear a 5mm wetsuit, and those who feel cold may also use an inner layer for added warmth.
December
In December, the water temperature drops quickly toward the end of the month in the Kerama Islands area. In early December it is still around 26°C, but by late December and toward the end of the year it typically falls to about 22–23°C.
Gentle Currents for Effortless Exploration
The islands’ gentle natural currents guide divers along reef slopes, walls, and coral gardens, creating a smooth, relaxing dive. This allows both beginners and experienced divers to focus on the underwater scenery without tiring themselves.
Divers often enjoy spotting green and hawksbill turtles, white tip reef sharks, sea snakes, and colorful tropical fish while floating effortlessly along the reef contours. The combination of abundant marine life and scenic underwater terrain makes every dive dynamic and memorable.
Dive Planning Tips by Season
- Spring: Great for calm dives and macro photography; younger fish appear around reefs.
- Summer: Warm water brings maximum marine life activity; coral colors are most vibrant.
- Autumn: Exceptional clarity for wide-angle photography and less crowded dive sites.
- Winter: Tranquil diving for experienced divers seeking peaceful reef exploration; calm seas and excellent visibility.
By aligning your visit with seasonal conditions, you can maximize encounters with marine life and enjoy safe, comfortable dives in Kerama.
Why Small-Group Guided Tours Matter
In our tours, small underwater groups ensure personalized guidance and safety. Dive guides adjust depth and pace according to your certification and experience, making it easy to enjoy the reefs, spot wildlife, and explore reef formations safely.
All dive sites are selected with sea conditions in mind, ensuring that even swim-throughs and shallow caves remain safe and accessible for divers of all levels. Beginners, intermediate, and advanced divers can all experience Kerama diving at its best.
Ready to Experience Kerama Diving in Okinawa?
If you’re looking for crystal-clear water, sea turtles, white tip reef sharks, sea snakes, and stunning underwater landscapes, the Kerama Islands are waiting for you.
In our tours, we focus on small underwater groups, personalized guidance, and safe yet dynamic dive experiences tailored to certified divers.
- 3 dives in one day
- Full equipment rental included
- Hotel pick-up from Naha
- No hidden fees
Whether you’re visiting Okinawa for a short trip or planning a dedicated diving holiday, we’ll help you experience the best of Kerama diving safely and comfortably.
👉 Book your Kerama diving tour today and discover the magic of Kerama Blue.
GOLD Scuba Diving
Explore More on Kerama Diving
- Kerama Diving – Complete Guide
- How to Dive the Kerama Islands from Naha
- Do I Need Advanced Certification to Dive in Okinawa?
- Best Kerama Dive Sites in Okinawa
- Kerama Diving: Best Time & Season Guide for Year-Round Diving
- Is Kerama Diving in Okinawa Suitable for Beginners?
- Kerama Diving Price Guide
- A Day in the Kerama Islands
- Marine Life & Underwater Landscapes in Kerama Islands
- Kerama Diving Okinawa
- Kerama Diving from Naha
- Small Group Diving in Kerama Islands
- Drift Diving in Kerama Islands
- Is One Day of Diving in the Kerama Islands Enough?
- Kerama Diving Safety Tips & Preparation Guide
- Two Days of Diving in Kerama
- Is Kerama Diving Worth It?
- Ear Clearing, Buoyancy & Emergency Response Guide
- Kerama Diving Packing List
- Kerama Diving Visibility