2025 Okinawa Snorkeling & Diving Monthly Weather Introduction

The weather is hot during the day most of the year and cool in the mornings, evenings and winter. Due to the influence of the northeast monsoon, the perceived temperature will be lower than the actual temperature, so a coat is occasionally needed in winter. The average sea temperature ranges from 21 degrees Celsius in February to 30 degrees Celsius in August, making it suitable for enjoying marine activities all year round.

Below is a detailed introduction to Okinawa's monthly climate and sea temperatures to help you plan your trip and enjoy the most.

January

• Average temperature: 17-21°C (62-70°F)
• Sea temperature: 20°C (68°F)

January is winter in Okinawa and the climate is relatively cool. There are occasional rain showers, but overall you can still explore Okinawa's waters in peace and tranquility. The sea water temperature is also suitable for snorkeling and diving at this time, but you need to take good warm-keeping measures.

But overall, January is a relatively quiet month, perfect for exploring Okinawa's waters with fewer tourists.

February

• Average temperature: 16-20°C (61-68°F)
• Sea temperature: 21°C (70°F)

February temperatures are similar to January, and sea temperatures are about the same. Despite the occasional rain, you can still enjoy the beauty of the underwater world. This is a quiet season. The marine life is still alive, allowing you to explore a magical world in the water.

At this time, you can enjoy the beautiful Ryukyu Kanhi-zakura in full bloom in Okinawa. The flowering period is around late January to February, which is the best time to experience the romantic atmosphere of spring.

March

• Average temperature: 17-21°C (63-70°F)
• Sea temperature: 22°C (71°F)

With the arrival of spring, the temperature in March begins to warm up. It’s also a great time for snorkeling and diving. The weather has become more stable and underwater visibility is very good.

April

• Average temperature: 19-24°C (66-75°F)
• Sea temperature: 23°C (73°F)

April is spring in Okinawa, with warm and sunny weather.

This is a warm and pleasant month, perfect for enjoying underwater adventures in sunny weather. Marine life also begins to become active, making this a vibrant season.

May

• Average temperature: 22-27°C (72-81°F)
• Sea temperature: 25°C (77°F)

This is an ideal month with warm sea water and stable weather. , the sea temperature rises, making it the best time for snorkeling and diving, allowing you to explore the colorful coral reefs and marine life. You can expect clear waters and colorful coral reefs, making for an excellent snorkeling and diving season.

June

• Average temperature: 24-29°C (75-84°F)
• Sea temperature: 26°C (79°F)

June is the rainy season in Okinawa, with heavy rainfall. Even though it will rain, But the rain will not affect your enjoyment of Okinawa's ocean scenery. The sea water is warm and clear. The underwater world is still beautiful and rich in marine life , Be aware of the humidity and thunderstorms, but you can still enjoy water activities.

July

• Average temperature: 26-31°C (79-88°F)
• Sea temperature: 28°C (82°F)

July is the hottest month in Okinawa. The hot weather does not diminish the charm of Okinawa at all. The beaches are crowded with people and various water activities are exciting.

Although there is a lot of rainfall, It is a great season for snorkeling and diving , water activities are still popular among tourists.

August

• Average temperature: 26-31°C (79-88°F)
• Sea temperature: 30°C (86°F)

The weather in August continues to be hot , Similar to July, but with slightly less rainfall . The rainy season tapers off towards the end of the month, giving way to clearer skies and more sunshine. This is a great time to enjoy the outdoors and explore Okinawa's natural beauty.

September

• Average temperature: 25-30°C (77-86°F)
• Sea temperature: 28°C (82°F)

September brings slightly cooler temperatures to Okinawa. The weather becomes more stable with less rainfall, making it a good time for snorkeling and diving. , allowing you to continue exploring the underwater world.