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Joetsu Weather and Climate: A Comprehensive Guide

The temperature in Joetsu can vary greatly throughout the year. The temperatures shift from very warm to cold. It also experiences much rain/snowfall throughout the year. Now, let’s break down all the climate details for a clearer picture.

Average maximum day and minimum night temperature

Depending on the time of the year, temperatures range from very warm to chilly in Joetsu. Average daytime temperatures reach a very warm 30°C in August. In February, the coolest month of the year, temperatures drop to a chilly 6°C.

At night, you can expect cooler temperatures, with averages dropping to around -1°C during this month. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Joetsu has a relatively rain/snowy climate with high precipitation levels, averaging 2168 mm of rain/snowfall annually. Joetsu can be quite wet during January, receiving approximately 257 mm of precipitation over 28 snowy/rainy days.

In contrast May, experiences much drier conditions, with 112 mm of rainfall, spread across 17 rainy days. For more details, please visit our Joetsu Precipitation page.

The mean monthly precipitation over the year, including rain, hail and snow

Sunshine over the year

Joetsu can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 6.6 hours of sunshine daily. In contrast, the city experiences much darker days in January, with only 2.2 hours of sunlight per day. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Forecast for Joetsu

Thu   Jan 16
4°C | -2°C
SE 2 m/s
18 mm
partly cloudy and sleet

partly cloudy and sleet

Fri   Jan 17
4°C | -1°C
NW 6 m/s
9.2 mm
broken clouds and rain

broken clouds and rain

Sat   Jan 18
5°C | -2°C
S 2 m/s
0.7 mm
partly cloudy and slight snow

partly cloudy and slight snow

Select a Month of Interest

Check the conditions for any month of the year.

The best time of year to visit Joetsu in Japan

During the months of May, June and October you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • When is summer in Joetsu?
    The hottest season / summer takes place in June, July, August and September.
  • Which is the warmest month in Joetsu?
    August has an average maximum temperature of 30°C and is the warmest month of the year.
  • Which is the coldest month in Joetsu?
    The coldest month is February with an average maximum temperature of 6°C.
  • Which is the wettest month in Joetsu?
    January tops the wettest month list with 257 mm of rainfall.
  • Which is the driest month in Joetsu?
    May is the driest month with 112 mm of precipitation.
  • Which is the sunniest month in Joetsu?
    May is the sunniest month with an average of 198 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.