Yakushima Weather in September
September in Yakushima brings high temperatures, with daytime highs of 28°C (82°F) and nights around 25°C (77°F). Quite a bit of rainfall is expected, around 246 mm (9.7 in), so pack an umbrella.
Rainfall in Yakushima in September
Historically, approximately 20 days this month are expected to have rain, averaging 246 mm (9.7 in). Expect frequent rainfall this month, and not just light drizzle. When it rains, it tends to come down hard.
Temperature in Yakushima in September
September in Yakushima sees highs of 28°C (82°F) and lows of 25°C (77°F) overnight. This kind of day-to-night contrast is typical for this time of year. At 25°C (77°F) overnight, it stays warm after dark. Light, breathable clothing and good airflow in your room make a noticeable difference.
Sunshine in Yakushima in September
The month experiences a moderate amount of sunlight, with 169 hours of sunshine. This provides a nice balance between sunshine and clouds.Should you favor a climate that's both dry and comfortably warm, August, October and November typically offer the most agreeable circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Yakushima's climate page.
Yakushima Temperature in September
Min Temperature
25°C (77°F)
Max Temperature
28°C (82°F)
Chance of Rain
68%
Precipitation
246 mm (9.7 in)
Rainy days
20 days
Humidity
79% *
Sunshine
169 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Yakushima typically stay consistent throughout September, with daily highs averaging around 28°C (82°F). Nights are warm, with lows typically ranging from 22°C (72°F) to 25°C (77°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Yakushima in September
Browse day-by-day weather records for Yakushima spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Yakushima historical weather extremes in September
The extremes listed below come from historical weather data collected in Yakushima from 1976 through 2025.
- The warmest day in September was on September 17, 2025, with a maximum of 37°C (99°F).
- On September 26, 2011, Yakushima saw its coldest September day with temperatures maxing out at 22°C (72°F).
- The lowest overnight temperature recorded in September was 10°C (50°F) (September 25, 2023).
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Yakushima in September
Warm temperatures in September make for comfortable sightseeing weather. Pack breathable fabrics like cotton shirts, knee-length shorts or skirts, and comfortable walking shoes. A thin long sleeve for indoor spaces is handy. Heavy rain is guaranteed, please bring a good poncho and waterproof everything! Sunglasses could come in handy during the sunnier parts of your trip.What To Do in Yakushima in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Yakushima's climate page.
Temperature Rainfall Sunshine Humidity
See the full Yakushima climate overview or explore weather in Japan.
