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Kusatsu Onsen

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Kusatsu Onsen Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Kusatsu Onsen year round climate

  • Spring (March–May): Average 2.9–12.4°C, mild climate, but early spring can be cold with occasional snowfall. March to May have more rainfall, so be prepared for rain. Common activities: Onsen bathing, enjoying early spring scenery, hiking (depending on weather conditions). Recommended clothing: Warm jacket, waterproof jacket, long-sleeved clothing, comfortable shoes.
  • Summer (June–August): Average 17.0–21.8°C, warm and humid climate, with the most rainfall in June. Common activities: Onsen bathing, outdoor hiking, enjoying natural scenery. Recommended clothing: Light and breathable clothing, rain gear, sun hat.
  • Autumn (September–November): Average 11.1–19.4°C, comfortable and pleasant climate, with gradually decreasing temperatures. September has relatively high rainfall. Common activities: Onsen bathing, leaf viewing (depending on tree species), hiking. Recommended clothing: Light jacket, long-sleeved clothing, comfortable shoes.
  • Winter (December–February): Average -2.8–-0.2°C, cold and dry climate, with little snowfall. Common activities: Onsen bathing, experiencing snowy scenery (if snow falls). Recommended clothing: Warm clothing, down jacket, scarf, gloves, hat, waterproof and warm boots.

Kusatsu Onsen climatological average

Annual average temperature: approx. 9.3°C / Annual rainfall: approx. 1270 mm / Summer humidity: 70%–80% / Rainiest month: June

Kusatsu Onsen monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-2.8°C
10.7
February
-2°C
47.2
March
2.9°C
91
April
9.2°C
116.5
May
12.4°C
158.8
June
17°C
197.6
July
21.7°C
174.5
August
21.8°C
131.8
September
19.4°C
154.3
October
11.1°C
103.2
November
5.9°C
70.6
December
-0.2°C
14

Kusatsu Onsen weather for the next seven days

4/10
Friday
Moderate rain
12°C/7.6°C
4/11
Saturday
Sunny
18.8°C/4.8°C
4/12
Sunday
Sunny
17.3°C/2°C
4/13
Monday
Partly Cloudy
19.8°C/7.9°C
4/14
Tuesday
Patchy rain nearby
17.9°C/9.5°C
4/15
Wednesday
Patchy rain nearby
16.8°C/6.7°C
4/16
Thursday
Sunny
15.8°C/3.6°C

Kusatsu Onsen Frequently Asked Questions and Useful Information for Travel

Is Kusatsu Onsen worth visiting in 2025?

Kusatsu Onsen is definitely worth a visit in 2025. Having visited quite a few hot spring towns over the years, I was very impressed by Kusatsu's atmosphere and onsen. Hidden in the Gunma mountains, Kusatsu Onsen feels like a charming little town and is especially beautiful in the evening when the Yubatake is lit up.

Does Kusatsu Onsen allow tattoos in 2025?

Yes, you can. While many traditional onsens in Japan still prohibit tattoos, Kusatsu Onsen offers a growing number of tattoo-friendly hot springs that welcome both locals and tourists with body art. These include public bathhouses, private onsens, and ryokan that do not require tattoo cover-ups.

What is the etiquette for using an onsen in Kusatsu Onsen?

Once in the changing area you will need to undress completely (no clothes, underwear or swimwear are permitted in the bathing area). You can leave your belongings in the designated baskets or lockers. If you like, you can take a small modesty towel with you to cover the important bits.

What are the key attractions in Kusatsu Onsen?

The most iconic attraction in Kusatsu Onsen is the Yubatake, the 'hot water field', where the steaming hot spring water flows. Visitors can also enjoy a stroll through the charming town, visit various public baths (sento), and experience the unique sulfurous hot springs that Kusatsu is famous for.

What can I expect from a stay at a ryokan in Kusatsu Onsen?

Staying at a ryokan in Kusatsu Onsen offers a traditional Japanese experience. You can expect tatami mat rooms, comfortable futon bedding, exquisite kaiseki (multi-course) dinners featuring local ingredients, and access to private or public onsen baths. It's a perfect way to immerse yourself in the relaxation and culture of the area.