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Joetsu Weather, Climate and Best Time to Visit

Data source:Meteostat
Update date:2025-09

Joetsu year round climate

  • Spring (March–May): Average -1.2–12.2°C, 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 16.8–22.1°C, 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 9.6–16.9°C, 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–-1.2°C, 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. 7.2°C / Annual rainfall: approx. 1426 mm / Summer humidity: 70%–80% / Rainiest month: August

Joetsu monthly average temperature and precipitation

Month
Air temperature (°C)
Precipitation (mm)
January
-8.4°C
58.4
February
-7.1°C
48.7
March
-1.2°C
65.6
April
7°C
70.7
May
12.2°C
88.9
June
16.8°C
175.4
July
21.4°C
144.5
August
22.1°C
250.6
September
16.9°C
179.5
October
9.6°C
144.3
November
3.1°C
117.6
December
-5.7°C
82.3

Joetsu weather for the next seven days

3/19
Thursday
Moderate or heavy snow showers
5.5°C/-3.4°C
3/20
Friday
Moderate or heavy snow showers
3.9°C/-3.4°C
3/21
Saturday
Moderate or heavy snow showers
0.2°C/-4.4°C
3/22
Sunday
Patchy rain nearby
6.1°C/-4.5°C
3/23
Monday
Patchy rain nearby
6.3°C/0.6°C
3/24
Tuesday
Moderate or heavy snow showers
1.4°C/-2°C
3/25
Wednesday
Partly Cloudy
4.8°C/-2.5°C