Mount Haku Weather in September
Mount Haku in September sees high daytime temperatures of 24°C (75°F) and nighttime lows of 15°C (59°F). As part of the rainy season, showers are frequent and often heavy. Budget around 306 mm (12 in) of rainfall for the month.
Rainfall in Mount Haku in September
Mount Haku is in the rainy season in September, with rain on around 20 days and an average of 306 mm (12 in). Rain during the rainy season here tends to be intense rather than just persistent drizzle. Expect significant downpours.
Temperature in Mount Haku in September
In September, expect high temperatures in Mount Haku, with highs of 24°C (75°F) and lows of 15°C (59°F) at night. September is in the summer season. The days can feel warmer than the evenings, so packing for both parts of the day is a good idea. With lows of 15°C (59°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.
Sunshine in Mount Haku in September
The area experiences a moderate amount of sunshine, with approximately 153 hours of sunlight expected. Even though this month is part of the rainy season, you could still see the sun every now and then.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Mount Haku. Our weather planner can help you explore destinations with more pleasant weather conditions.
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 Mount Haku's climate page.
Mount Haku Temperature in September
Min Temperature
15°C (59°F)
Max Temperature
24°C (75°F)
Chance of Rain
66%
Precipitation
306 mm (12 in)
Rainy days
20 days
Humidity
76% *
Sunshine
153 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Mount Haku typically drop from around 29°C (84°F) at the start of September to approximately 24°C (75°F) by the end. Nights are pleasant, with lows typically ranging from 16°C (61°F) to 22°C (72°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 Mount Haku in September
Browse day-by-day weather records for Mount Haku spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Mount Haku historical weather extremes in September
Our historical data for Mount Haku spans 1976 to 2025, revealing these weather extremes.
- Mount Haku recorded its highest September temperature of 36°C (97°F) on September 1, 1985.
- The lowest daytime temperature in September was 16°C (61°F), recorded on September 29, 2008.
- Mount Haku registered its coldest September night on September 28, 1992, with temperatures dropping to 8°C (46°F).
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 Mount Haku in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. It's going to pour! Pack a good poncho and prepare for very wet conditions. Bring sunglasses since you'll have some sunny periods throughout the monthWhat To Do in Mount Haku 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 Mount Haku's climate page.
Temperature Rainfall Sunshine Humidity
See the full Mount Haku climate overview or explore weather in Japan.
