Spring (March–May): Average 34–51°F, 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 58–68°F, 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 50–63°F, 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–-33.4°F, 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. 46.2°F / Annual rainfall: approx. 1974 mm / Summer humidity: 70%–80% / Rainiest month: August
Hakkaisan monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
25.3°F
43.3
February
26.6°F
60.7
March
34.3°F
142.1
April
44.8°F
148.4
May
51.1°F
254.7
June
58.8°F
232
July
67.8°F
198.4
August
68°F
335.4
September
63.3°F
279.4
October
50°F
145.4
November
41.7°F
107.7
December
30.6°F
27
Hakkaisan weather for the next seven days
12/19
Friday
Sunny
50.4°F/27.3°F
12/20
Saturday
Partly Cloudy
56.9°F/36.2°F
12/21
Sunday
Patchy rain nearby
59.2°F/43°F
12/22
Monday
Moderate rain
43.1°F/34.6°F
12/23
Tuesday
Patchy rain nearby
46.1°F/34.9°F
12/24
Wednesday
Patchy rain nearby
46.3°F/33.5°F
12/25
Thursday
Patchy rain nearby
41.6°F/34.3°F
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