Yakushima Temperature by Month

Yakushima in Kagoshima, Japan sees significant seasonal temperature differences, with daytime highs between 16°C (61°F) in January and 29°C (84°F) in August, averaging 23°C (73°F) annually. Explore the full monthly breakdown below.

In Yakushima, temperatures can shift dramatically between warm in summer and mild in winter. Nights follow the same pattern, with lows ranging from 27°C (81°F) in August to 12°C (54°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Yakushima by month:

Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 230 hours of sunshine.

The chart below shows the average temperature throughout the year:

Yakushima's average annual maximum temperature is 23°C (73°F). To put that in context, here's how it compares to a few well-known destinations:

Lisbon, Portugal averages 21°C (70°F) annually, warm summers, mild winters, and rain mainly in the cooler months.

Reykjavík, Iceland averages 9°C (48°F) a year, mild summers by Icelandic standards, but cold winters and frequent wind.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Yakushima, January is the coolest month, with average highs of 16°C (61°F) and humidity around 65%, considered high. In August, the warmest month, temperatures average 29°C (84°F) with 81% humidity, conditions that feel very high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Yakushima this rarely lasts long on the ground.

For more on Yakushima's weather, including monthly rainfall, sunshine hours, and humidity, visit our Yakushima climate page.