Climate Insights for Shimoji-Shima Island

The climate in Shimoji-Shima Island is warm and mild. The average annual temperature is 25°C and approximately 1980mm of precipitation falls per year. Shimoji-Shima Island receives a notable amount of rainfall throughout the year, including during its driest month. Shimoji-Shima Island is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are January, February, March, when temperatures can drop to 19°C.

Shimoji-Shima Island has relatively stable temperatures year-round, staying within a 10°C range. The warmest month is July, when average highs reach 29°C and the mean temperature sits around 29°C. January is the coolest month, with minimum temperatures around 19°C and an average of 20°C. Daily temperature variation is modest, with an average difference of 1°C between highs and lows. The sharpest temperature change occurs between November and December, with a 3°C shift in average temperatures.

Shimoji-Shima Island is a fairly wet location, receiving approximately 1980mm of precipitation annually, which averages out to around 165mm per month. The wettest month is August, averaging 268mm of rainfall. September and May also tend to see above-average precipitation. The driest month is February, with just 88mm. That's 180mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Shimoji-Shima Island is very windy, with an average annual wind speed of 33km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 40km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in May, with average winds dropping to 28km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 12km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 37km/h in winter, 31km/h in spring, 29km/h in summer, 34km/h in autumn.

It is currently spring in Shimoji-Shima Island, which began on March 20, 2026. Shimoji-Shima Island is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 29°C, while the coldest stretch bottoms out in January near 19°C. Summer is next, beginning on June 21, 2026 — 87 days from now.

The best time to visit Shimoji-Shima Island is during February, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 88mm per month. By contrast, July can be uncomfortably hot with highs reaching 29°C, while January is the coldest period with lows dropping to 19°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Shimoji-Shima Island based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.