Spring (March–May): Average 3.4–13.7°C, mild but still chilly, increasing rainfall. Common activities: Hiking, flower viewing (e.g., cherry blossoms, depending on blooming conditions). Recommended clothing: Warm jacket, sweater, long pants.
Summer (June–August): Average 17.9–24.5°C, warm and humid, with the most rainfall in August. Common activities: Outdoor activities, but be mindful of rain. Recommended clothing: Light and breathable clothing, rain gear.
Autumn (September–November): Average 13.7–20.8°C, comfortable and pleasant, but with a larger temperature difference between morning and evening. Common activities: Maple leaf viewing (depending on leaf color change), hiking and trekking. Recommended clothing: Light jacket, long-sleeved shirt, comfortable shoes.
Winter (December–February): Average -2.0–-0.7°C, cold, with a low probability of snowfall. Common activities: Skiing (depending on snow conditions), indoor activities. Recommended clothing: Heavy coat, warm clothing, hat, gloves, scarf.
Onuma climatological average
Annual average temperature: approx. 10.8°C / Annual rainfall: approx. 1172 mm / Summer humidity: 70%–80% / Rainiest month: August
Onuma monthly average temperature and precipitation
Month
Air temperature (°C)
Precipitation (mm)
January
-2°C
94
February
-1.3°C
36
March
3.4°C
64.7
April
9.6°C
44.3
May
13.7°C
72
June
17.9°C
129.3
July
22.7°C
93.7
August
24.5°C
245
September
20.8°C
94.3
October
13.7°C
116.7
November
7.1°C
99.7
December
-0.7°C
83
Onuma weather for the next seven days
10/16
Thursday
Patchy rain nearby
16.8°C/11.6°C
10/17
Friday
Patchy rain nearby
17.5°C/11.7°C
10/18
Saturday
Moderate rain
16°C/11.8°C
10/19
Sunday
Patchy rain nearby
11.9°C/6.7°C
10/20
Monday
Patchy rain nearby
10.9°C/5°C
10/21
Tuesday
Patchy rain nearby
10.4°C/3.9°C
10/22
Wednesday
Partly Cloudy
11.2°C/4.8°C
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