Niseko Weather in September
September in Niseko brings pleasant temperatures, with daytime highs of 22°C (72°F) and nights around 13°C (55°F). Quite a bit of rainfall is expected, around 157 mm (6.2 in), so pack an umbrella.
Rainfall in Niseko in September
Historically, approximately 18 days this month are expected to have rain, averaging 157 mm (6.2 in). Rain falls regularly this month and can be quite heavy when it does. Showers can be substantial, so waterproof gear is a good idea.
Temperature in Niseko in September
Expect highs of 22°C (72°F) in Niseko in September, with nights dropping to around 13°C (55°F). September marks the summer season. Conditions are often most pleasant around the middle of the day. Nights cool down to 13°C (55°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.
Sunshine in Niseko in September
The month experiences a moderate amount of sunlight, with 161 hours of sunshine. This provides a nice balance between sunshine and clouds.If you prefer enjoying temperate temperatures and rain-free days, June typically offers the best 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 Niseko's climate page.
Niseko Temperature in September
Min Temperature
13°C (55°F)
Max Temperature
22°C (72°F)
Chance of Rain
60%
Precipitation
157 mm (6.2 in)
Rainy days
18 days
Humidity
71% *
Sunshine
161 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Niseko typically drop from around 24°C (75°F) at the start of September to approximately 19°C (66°F) by the end. Nights are cool, with lows typically ranging from 9°C (48°F) to 17°C (63°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 Niseko in September
Browse day-by-day weather records for Niseko spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Niseko historical weather extremes in September
Based on weather observations in Niseko between 1976 and 2025, these are the recorded extremes during September.
- The warmest day in September was on September 18, 2012, with a maximum of 31°C (88°F).
- On September 27, 2008, Niseko saw its coldest September day with temperatures maxing out at 10°C (50°F).
- Nighttime temperatures dropped to 2°C (36°F) on September 29, 1992, marking the coldest September night on record.
- The wettest day in September Niseko was on September 13, 2025 with 86 mm (3.4 in) of precipitation.
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 Niseko in September
For Niseko in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Niseko 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 Niseko's climate page.
Temperature Rainfall Sunshine Humidity
See the full Niseko climate overview or explore weather in Japan.
