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Mount Aso

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Mount Aso Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Mount Aso year round climate

  • Spring (March–May): Average 5–13°C, cool climate with abundant sunshine and little rainfall. Common activities: Hiking, appreciating the Aso volcano scenery. Recommended clothing: Warm jacket, long-sleeved clothing, comfortable hiking shoes.
  • Summer (June–August): Average 17–23°C, warm and comfortable climate, with less rainfall in some months. Common activities: Hiking, camping, appreciating grassland scenery. Recommended clothing: Light and breathable clothing, sun hat, sunscreen.
  • Autumn (September–November): Average 9–16°C, pleasant climate, dry and comfortable, with little rainfall. Common activities: Hiking, appreciating autumn leaves, experiencing hot springs. Recommended clothing: Light jacket, long-sleeved clothing.
  • Winter (December–February): Average 1–5°C, cold and dry climate, very little rainfall. Common activities: Viewing snow scenery (depending on the situation), experiencing hot springs. Recommended clothing: Warm jacket, hat, gloves, scarf, warm underwear.

Mount Aso climatological average

Annual average temperature: approx. 12°C / Annual rainfall: approx. 104 mm / Summer humidity: 60%–70% / Rainiest month: June

Mount Aso monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
1.5°C
1.4
February
4.1°C
7.9
March
5°C
13.5
April
12.1°C
10
May
13.5°C
10
June
17.2°C
22.5
July
22°C
10.7
August
23.2°C
13.2
September
21.1°C
3.4
October
15.7°C
5.3
November
9.1°C
5.6
December
1.3°C
0.6

Mount Aso weather for the next seven days

9/20
Sunday
Patchy rain nearby
24.8°C/18.2°C
9/21
Monday
Patchy rain nearby
21°C/17.1°C
9/22
Tuesday
Sunny
23.7°C/15°C
9/23
Wednesday
Sunny
25.6°C/13.1°C
9/24
Thursday
Sunny
26.7°C/15.7°C
9/25
Friday
Partly Cloudy
26.6°C/16.5°C
9/26
Saturday
Patchy rain nearby
24.6°C/17.9°C

Mount Aso Frequently Asked Questions and Useful Information for Travel

Is Mount Aso still active?

Yes, Mount Aso is an active volcano in Japan that has regular eruptions and ongoing volcanic unrest. While it is open to tourists, access to the crater is often restricted or temporarily closed due to volcanic activity, gas emissions, or bad weather, so visitors should check the current status before going. The volcano shows continuous signs of unrest, including sulfur dioxide emissions and occasional volcanic tremors. The most recent major eruption of the main crater occurred in October 2021, but smaller events and steam emissions are frequent. The area around the crater is often restricted to prevent injury from poisonous gases or the risk of eruption. Access is sometimes permitted, but visitors should stay informed about current conditions. Due to toxic gases, the area around the crater is not recommended for people with heart or lung conditions, including asthma.

Is Mount Aso worth visiting?

A far cry from the flashing lights of Tokyo and the bustling crowds of Osaka, the volcanic caldera of Aso provides visitors with a fulfilling sense of peace and serenity. Embark on scenic drives, gorgeous hikes, and bathe in volcanic hot springs, all while surrounded by untouched natural beauty.

What is Mount Aso famous for?

Mount Aso is a volcano located in Kumamoto Prefecture on Kyushu Island, Japan. It is one of the largest active volcanoes in Japan and is very famous for the caldera formed by a previous eruption. It is registered as a World Geopark.

How long does it take to hike Mount Aso?

The Mount Aso Loop is considered a hard hike that covers 4.6 miles, with an elevation gain of 1,814 feet. It takes about 3.5–4 hours to complete.

What are the main attractions around Mount Aso?

Beyond the majestic crater of Mount Aso itself, visitors can explore the vast caldera, enjoy scenic drives through the Kusasenri Plateau, discover the beautiful Daikanbo viewpoint for panoramic vistas, and relax in natural hot springs. The region also offers opportunities for hiking and experiencing the unique volcanic landscape.