Chase the autumn leaves in Japan
Japan is one of these cases which turns into a gold, yellow and orange fairy tale starting from September. And we can honestly say: We cannot imagine a more beautiful season to visit Japan.
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.
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
*
* Data from: Sapporo, Japan (60 KM, 37 Miles).
Niseko Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Niseko - and find the best time to visit.
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 records 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 2026, 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
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
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.
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Swimming6/10 -
Camping6/10
Niseko 3-Day Forecast
More climate data for Niseko
Temperature Rainfall Sunshine Humidity
See the full Niseko climate overview or explore weather in Japan.
Popular in September
Where to go in September - average daytime high across popular destinations.
Bucket list
Need travel inspiration? Check out our bucket list articles and be inspired.
Chase the autumn leaves in Japan
Walk the 88 temple circuit
We recommend walking the 88 temple circuit from April til October. Although June, July and August can be a bit wet, hot and humid.
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10 reasons why you should visit Japan in winter
Here are 10 reasons why you should plan a winter trip to Japan. During this period, popular sights are less busy and prices for flights and hotels much cheaper.