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Mount Asama

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Mount Asama Weather, Climate and Best Time to Visit

Data source：Meteostat
Update date：2025-09

Mount Asama year round climate

  • Spring (March–May): 37–54°F on average. The climate is variable; early spring remains cold, while late spring gradually warms with increasing rainfall. Common activities: Hiking (be aware of weather changes), enjoying mountain scenery. Recommended clothing: Warm jacket, fleece, waterproof jacket.
  • Summer (June–August): 62–71°F on average. Pleasant temperatures, high humidity, and frequent rainfall. Common activities: Hiking in cool areas (such as mountaintops) for summer respite, enjoying natural landscapes. Recommended clothing: Light and breathable clothing, rain gear.
  • Autumn (September–November): 51–66°F on average. Pleasant climate, reduced rainfall, and gradually decreasing temperatures. Common activities: Hiking, viewing autumn leaves (if available in the mountain area). Recommended clothing: Comfortable long-sleeved clothing, light jacket.
  • Winter (December–February): -2.8–-32.4°F on average. Cold temperatures, low rainfall, and potential snowfall. Common activities: Skiing (if nearby ski resorts are available), enjoying winter mountain views (pay attention to keeping warm). Recommended clothing: Heavy warm jacket, hat, gloves, scarf.

Mount Asama climatological average

Annual average temperature: approx. 48.7°F / Annual rainfall: approx. 1270 mm / Summer humidity: 70%–80% / Rainiest month: June

Mount Asama monthly average temperature and precipitation

Month
Air temperature (°F)
Precipitation (mm)
January
27°F
10.7
February
28.4°F
47.2
March
37.2°F
91
April
48.6°F
116.5
May
54.3°F
158.8
June
62.6°F
197.6
July
71.1°F
174.5
August
71.2°F
131.8
September
66.9°F
154.3
October
52°F
103.2
November
42.6°F
70.6
December
31.6°F
14

Mount Asama weather for the next seven days

5/5
Tuesday
Sunny
63.5°F/35.3°F
5/6
Wednesday
Sunny
65.1°F/40.6°F
5/7
Thursday
Patchy rain nearby
70°F/47°F
5/8
Friday
Patchy rain nearby
68.9°F/42.7°F
5/9
Saturday
Patchy rain nearby
60.2°F/38.3°F
5/10
Sunday
Sunny
65.5°F/37.7°F
5/11
Monday
Patchy rain nearby
59.6°F/49.6°F

Mount Asama Frequently Asked Questions and Useful Information for Travel

When was the last time Mount Asama erupted?

The last eruption was in 2019, and Mt. Asama continues to puff away to let us know it is still alive. Bordering Gunma and Nagano prefectures, Mt. Asama is a 2,568-meter active volcano.

Can you climb Mount Asama?

From the trailhead at Takamine Kogen Onsen, the trek to the summit takes about 3.5 hours. While there are some steep sections, it should be manageable for those of average fitness. You'll pass through dense forest before moving above the tree line into the mountain's volcanic realm.

What towns are near Mount Asama?

Small eruptions are not uncommon on Mount Asama, which overlooks the towns of Karuizawa, Miyota, and Komoro in Nagano and Naganohara and Tsumagoi in Gunma.

How active is Mount Asama?

Mount Asama (浅間山, Asama-yama) is an active complex volcano in central Honshū, the main island of Japan. The volcano is the most active on Honshū. The Japan Meteorological Agency classifies Mount Asama as rank A.

What is the elevation of Mount Asama?

Mount Asama stands at an impressive 2,568 meters (approximately 8,425 feet) above sea level, making it a significant peak in central Honshu, Japan.