Nozawa Onsen Weather in September

September in Nozawa Onsen sees daytime temperatures around 25°C (77°F) and lows of 16°C (61°F) at night. Being part of the rainy season, heavy rainfall is a regular part of the day, so pack accordingly.

Rainfall in Nozawa Onsen in September

Nozawa Onsen is in the rainy season in September, with rain on around 20 days and an average of 212 mm (8.3 in). With rain on many days and solid totals, showers are frequent and often moderately heavy. Waterproof gear is a sensible idea.

Temperature in Nozawa Onsen in September

Daytime temperatures in Nozawa Onsen reach 25°C (77°F) in September, dropping to 16°C (61°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 overnight lows of 16°C (61°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.

Sunshine in Nozawa Onsen in September

You can expect a moderate amount of sunlight, with approximately 128 hours. Even though this month is part of the wet season, you can still see the sun occasionally.

For Nozawa Onsen itself, May generally stands out with 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.

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For a detailed overview over the year and the best time to visit Japan, check out our Nozawa Onsen's climate page.

Nozawa Onsen Temperature in September

Min Temperature 16°C (61°F)  

Max Temperature 25°C (77°F)  

Chance of Rain 67%  

Precipitation 212 mm (8.3 in)  

Rainy days 20 days  

Humidity 79% *  

Sunshine 128 hours *  

Percentage Sunshine *  

* Data from: Joetsu, Japan (30 KM, 19 Miles).

Daily Historical Temperatures

49-year average (1976-2025)

Based on our historical records, temperatures in Nozawa Onsen typically drop from around 28°C (82°F) at the start of September to approximately 23°C (73°F) by the end. Nights are pleasant, with lows typically ranging from 15°C (59°F) to 21°C (70°F).

Average temperatures in September

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Daily Historical Precipitation

49-year average (1976-2025)

Average daily rainfall for each day of the month based on long-term records.

Average precipitation in September

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Historical weather for Nozawa Onsen in September

Browse day-by-day weather records for Nozawa Onsen spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.

Historical weather Temperatures Precipitation

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Nozawa Onsen historical weather extremes in September

Based on 19 years of weather observations in Nozawa Onsen between 2006 and 2025, these are the recorded extremes.

• Nozawa Onsen recorded its highest September temperature of 35°C (95°F) on September 3, 2020.
• Nozawa Onsen experienced its chilliest September day on September 30, 2007, reaching only 17°C (63°F).
• The lowest overnight temperature recorded in September was 10°C (50°F) (September 28, 2008).
• The wettest September day on record brought 110 mm (4.3 in) of precipitation to Nozawa Onsen (September 16, 2013).

What to Wear in Nozawa Onsen in September

For Nozawa Onsen 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 Nozawa Onsen in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Camping

6/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit Japan, check out our Nozawa Onsen's climate page.

More climate data for Nozawa Onsen

Temperature Rainfall Sunshine Humidity

See the full Nozawa Onsen climate overview or explore weather in Japan.