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Unzen

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Unzen Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Unzen year round climate

  • Spring (March–May): Average 12.7–20.4°C, mild climate but with relatively high rainfall. Cherry blossoms start blooming in March, but it also rains frequently; please check weather forecasts. Common activities: Cherry blossom viewing, onsen (hot spring) bathing, hiking (be mindful of weather changes). Recommended clothing: Light jacket, comfortable and breathable long-sleeved clothing, and rain gear.
  • Summer (June–August): Average 24.0–29.6°C, hot and humid with abundant rainfall, especially in June. Common activities: Summer resort, relaxation at onsen (hot spring) inns, viewing cloud seas (be mindful of weather conditions). Recommended clothing: Light and breathable short-sleeved clothing, rain gear, and sunscreen.
  • Autumn (September–November): Average 20.9–27.3°C, pleasant and comfortable climate with gradually decreasing rainfall. Common activities: Hiking, viewing autumn leaves (in some areas), onsen (hot spring) bathing. Recommended clothing: Comfortable long-sleeved clothing, light jacket.
  • Winter (December–February): Average 7.8–9.1°C, cold climate with less rainfall. Common activities: Onsen (hot spring) bathing, viewing winter scenery. Recommended clothing: Warm jacket, sweater, scarf, gloves, etc.

Unzen climatological average

Annual average temperature: approx. 18.5°C / Annual rainfall: approx. 2349 mm / Summer humidity: 70%–80% / Rainiest month: June

Unzen monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
7.8°C
79.8
February
8.8°C
130.8
March
12.7°C
185.9
April
17.1°C
227
May
20.4°C
265.7
June
24°C
380.4
July
28.6°C
329.5
August
29.6°C
237.2
September
27.3°C
232.1
October
20.9°C
90.6
November
16°C
118
December
9.1°C
72.1

Unzen weather for the next seven days

6/24
Wednesday
Heavy rain
20.9°C/19.4°C
6/25
Thursday
Heavy rain
23.3°C/21.6°C
6/26
Friday
Heavy rain
20°C/17.8°C
6/27
Saturday
Patchy rain nearby
25.5°C/20.2°C
6/28
Sunday
Patchy rain nearby
25.2°C/20.9°C
6/29
Monday
Sunny
25.4°C/20.7°C
6/30
Tuesday
Patchy rain nearby
24°C/21.5°C

Unzen Frequently Asked Questions and Useful Information for Travel

Is Unzen worth visiting?

Unzen offers a wonderful blend of recreation and relaxation. Whether you enjoy hiking through its scenic mountains or simply soaking in the natural beauty, Unzen provides diverse experiences. As part of the expansive Unzen-Amakusa National Park, its peaks are easily accessible via the Nita-Toge ropeway, offering breathtaking views.

What is Mount Unzen known for?

Mount Unzen is an active stratovolcano located on the Shimabara Peninsula. It has a history of dramatic eruptions, most notably the devastating event in 1792. Today, it's a significant natural landmark within the Unzen-Amakusa National Park, attracting visitors interested in its volcanic geology and surrounding natural landscapes.

When did Mount Unzen last erupt?

Mount Unzen experienced its most recent period of volcanic activity between 1990 and 1996. The last documented event was a partial collapse of a lava dome on May 1, 1996, which triggered a pyroclastic flow. A major and fatal eruption occurred on June 3, 1991, causing the deaths of 43 people.

What are the main attractions in Unzen?

Unzen is renowned for its stunning natural landscapes, particularly its volcanic terrain and hot springs. Visitors can explore the Unzen-Amakusa National Park, ride the Nita-Toge ropeway for panoramic views, and experience the therapeutic benefits of the local onsen (hot springs). The area also offers hiking trails for those looking to connect with nature.

Can I hike in Unzen?

Yes, Unzen is an excellent destination for hiking. The Unzen-Amakusa National Park features numerous trails that allow visitors to explore the mountainous scenery and volcanic formations. The Nita-Toge ropeway provides convenient access to higher elevations, making it easier to reach viewpoints and trailheads for more adventurous treks.