Spring (March–May): Average -34–53°F, the climate transitions from cold to mild, with chances of snowfall in March; it gradually warms up starting in April. Common activities: viewing spring scenery, spring outings. Recommended clothing: warm coat, sweater, scarf, hat.
Summer (June–August): Average 62–71°F, warm and humid climate with more rainfall, particularly in August. Common activities: mountain hiking (be mindful of weather changes), riverside recreation. Recommended clothing: light and breathable clothing, rain gear.
Autumn (September–November): Average 49–62°F, comfortable and cool climate with gradually decreasing rainfall. Common activities: viewing autumn leaves, mountain climbing. Recommended clothing: light jacket, long-sleeved shirt.
Winter (December–February): Average -8.4–-34.2°F, cold and dry climate with significant snowfall. Common activities: skiing, snow activities. Recommended clothing: warm clothing, thick coat, waterproof snow boots.
Joetsu climatological average
Annual average temperature: approx. 45.0°F / Annual rainfall: approx. 1426 mm / Summer humidity: 70%–80% / Rainiest month: August
Joetsu monthly average temperature and precipitation
Month
Air temperature (°F)
Precipitation (mm)
January
16.9°F
58.4
February
19.2°F
48.7
March
29.8°F
65.6
April
44.6°F
70.7
May
54°F
88.9
June
62.2°F
175.4
July
70.5°F
144.5
August
71.8°F
250.6
September
62.4°F
179.5
October
49.3°F
144.3
November
37.6°F
117.6
December
21.7°F
82.3
Joetsu weather for the next seven days
10/17
Friday
Patchy rain nearby
56.1°F/44.8°F
10/18
Saturday
Moderate rain
54.1°F/45°F
10/19
Sunday
Moderate rain
45°F/36.4°F
10/20
Monday
Moderate rain
40.1°F/34.5°F
10/21
Tuesday
Patchy rain nearby
42.6°F/34.5°F
10/22
Wednesday
Patchy rain nearby
42°F/35.5°F
10/23
Thursday
Patchy rain nearby
39.2°F/34.2°F
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