Weather in Oki Islands

Planning a trip to the Oki Islands? Here you will find the latest information on weather conditions, including up-to-date forecasts and clear charts to prepare for your trip.

The climate on the Oki Islands can be described as temperate and humid, with a noticeable influence from the Sea of Japan. Thanks to the island location, extreme temperature fluctuations are rarely observed here: winter passes without severe frosts, and summer, while warm, is usually devoid of stifling heat. Overall, the weather is conducive to comfortable tourism, although high humidity year-round should be taken into account.

Seasons change smoothly here but have their own characteristic features. Summer (especially July and August) is the warmest time, when the average temperature holds at a comfortable +25...+27°C. Winter, on the other hand, is quite mild, with averages around +6...+9°C, but is distinguished by its overcast nature: December and January see the highest number of days with precipitation (up to 22 days per month).

Spring and autumn are considered the most favourable periods for exploring the nature of the archipelago. In April, May, and October, pleasant weather sets in with temperatures from +13°C to +19°C. Moreover, these months account for a relatively small number of rainy days, making them ideal for hiking and excursions to the picturesque places of Japan.

The climate on the Oki Islands is formed under the strong influence of the sea, which ensures smoothed temperature changes and an absence of extreme weather conditions. The annual cycle begins with a cool winter: the lowest figures are recorded in January and February, when the average temperature holds at the level of +6...+7°C. At this time, nights are cool, around +5°C, but frosts happen extremely rarely, making winter here much milder compared to many other regions.

The summer season brings perceptible warmth and high humidity. The hottest month is traditionally August with an average temperature of about +27°C and maximums reaching +28°C. July also pleases with warmth (+25°C), however, thanks to the island location, the stifling heat characteristic of mainland Japanese metropolises is rare here. Sea breezes help to tolerate high temperatures more easily, creating a comfortable atmosphere for travel.

A characteristic feature of the local temperature regime is the surprisingly small difference between day and night figures. Throughout the year, daily fluctuations often do not exceed 2–4 degrees. For example, at the height of summer, the night temperature drops only to +26°C, remaining practically the same as during the day. Spring and autumn — May and October — offer a "happy medium" with comfortable figures around +17...+19°C, ideally suited for long walks.

The climate on the Oki Islands is characterized by noticeable seasonal differences in the frequency of precipitation. The winter period is considered the wettest and gloomiest here: in December and January, the number of days with precipitation exceeds 20 per month. Given average temperatures around +6...+8°C, it rains most often at this time, sometimes alternating with sleet, so waterproof clothing and footwear will be extremely necessary.

The most favourable time for those who prefer dry weather is spring. In April and May, the lowest number of rainy days in the year is recorded — on average about 9 days per month. This makes the spring season an excellent choice for hiking and exploring the natural beauty of the archipelago when the probability of getting wet is minimal.

Summer brings a rise in temperature and an increase in humidity. In July, the frequency of precipitation increases (about 14 rainy days), which may be associated with seasonal rains characteristic of this region of Japan. In autumn, the weather remains changeable, however, October stands out as a relatively dry and comfortable month before the start of the winter rainy season.

When packing for a trip to the Oki Islands, it is important to consider the changeable maritime climate of this region. The main secret of comfort here is the principle of layering in clothing. In winter and early spring, when the temperature fluctuates from +5°C to +10°C, and the number of rainy days exceeds 15–20 per month, you will need thermal underwear, warm fleece, and a high-quality windproof jacket with a hood. Wind protection is critically important here, as sea breezes can intensify the feeling of coolness.

Summer on the islands is warm, but not exhaustingly hot, with an average temperature of about +25...+27°C. For this season, choose light items made of natural breathable fabrics, but do not forget that rains are likely even in July and August. Be sure to put a light raincoat or a compact umbrella in your suitcase, as well as sunscreen and a hat to protect yourself from the active sun during walks along the coast.

Since exploring the archipelago involves many walking routes, comfortable footwear is your main priority. Broken-in trainers or light trekking boots with non-slip soles that can withstand damp weather are best suited. We also recommend taking a windbreaker with you even for summer trips, as it can be quite chilly on the open deck during ferry crossings between the islands.