Joetsu Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Joetsu.
Climate overview of Joetsu
Joetsu, Niigata Prefecture, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 30°C (86°F) in August, while winters cool to 6°C (43°F) in January.
With around 2168 mm (85 in) of annual rain/snowfall, Joetsu has a notably wet climate. However, this rain/snowfall is not evenly distributed, the city has a distinct rainy season from September to February, with very warm summers and cold winters. The wettest month is January. The sunniest month is May, with 6.6 hours of sunshine per day on average.
Joetsu Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Joetsu - and find the best time to visit.
Monthly Temperature in Joetsu
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 (86°F) in August. In January, the coolest month of the year, temperatures drop to a chilly 6°C (43°F).
At night, temperatures range from around 23°C (73°F) in August to -1°C (30°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Joetsu
Joetsu has a relatively rain/snowy climate with high precipitation levels, averaging 2168 mm (85 in) of rain/snowfall annually. Joetsu can be quite wet during January, receiving approximately 257 mm (10 in) of precipitation over 28 snowy/rainy days.
In contrast, during the driest month (May), you will experience much drier conditions, with 112 mm (4.4 in) of precipitation 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
The average number of days each month with precipitation
Sunshine Hours in Joetsu
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
Humidity in Joetsu by Month
The relative humidity is high throughout the year in Joetsu.
The city experiences its highest humidity in July, reaching 80%. In April, the humidity drops to its lowest level at 67%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Joetsu
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May, June and October
- Warmest weather: August
- Most sunshine: May and August
- Seasonal pattern: A distinct rainy season from September to February, with very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -1°C (30°F).
Frequently asked questions about the climate in Joetsu
What is the best time to visit Joetsu?
May, June and October typically offer the most optimal weather in Joetsu. In contrast, January, February, March and December tend to have less optimal conditions. Joetsu has a distinct rainy season from September to February, with very warm summers and cold winters.
What temperatures can I expect in Joetsu?
Daytime highs range from 6°C (43°F) in January to 30°C (86°F) in August. Nighttime lows range from -1°C (30°F) to 23°C (73°F). Temperatures vary considerably through the year.
How much rain does Joetsu get?
Annual rainfall is around 2168 mm (85 in). January is the wettest month with 257 mm (10 in), while May is the driest with 112 mm (4.4 in). In the coldest months, precipitation may fall as snow/rain.
How sunny is Joetsu?
Joetsu receives around 1,602 hours of sunshine per year. May is the sunniest month with 198 hours, while January is the cloudiest with just 67 hours.
Joetsu 3-Day Forecast
Joetsu on the map
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