Spring (March–May): Average 1.3–10.6°C, cold and humid climate with significant rainfall. Be sure to dress warmly. Common activities: Hiking (prepare for rain). Recommended clothing: Waterproof jacket, warm clothing, hiking boots.
Summer (June–August): Average 14.9–20.0°C, warm and humid climate with frequent rainfall, especially in August. Common activities: Beat the heat (choose indoor activities or lower altitudes), appreciate mountain scenery. Recommended clothing: Light and breathable clothing, rain gear.
Autumn (September–November): Average 10.0–17.4°C, cool climate with gradually decreasing rainfall. Common activities: Viewing autumn leaves (depending on altitude and tree species), hiking. Recommended clothing: Comfortable long-sleeved clothing, light jacket.
Winter (December–February): Average -3.7–-0.8°C, cold and dry climate with the least rainfall. Common activities: Skiing (depending on snow conditions), appreciating snow scenery. Recommended clothing: Heavy warm clothing, waterproof jacket, snow boots.
Hakkaisan climatological average
Annual average temperature: approx. 7.9°C / Annual rainfall: approx. 1974 mm / Summer humidity: 70%–80% / Rainiest month: August
Hakkaisan monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
-3.7°C
43.3
February
-3°C
60.7
March
1.3°C
142.1
April
7.1°C
148.4
May
10.6°C
254.7
June
14.9°C
232
July
19.9°C
198.4
August
20°C
335.4
September
17.4°C
279.4
October
10°C
145.4
November
5.4°C
107.7
December
-0.8°C
27
Hakkaisan weather for the next seven days
11/3
Monday
Heavy rain
10.2°C/4.7°C
11/4
Tuesday
Patchy rain nearby
13.3°C/2.4°C
11/5
Wednesday
Sunny
15.9°C/3.7°C
11/6
Thursday
Sunny
16.1°C/5.7°C
11/7
Friday
Sunny
16.8°C/5.1°C
11/8
Saturday
Patchy rain nearby
16.7°C/6.4°C
11/9
Sunday
Patchy rain nearby
15.6°C/8.7°C
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