Kusatsu Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Kusatsu.
Climate overview of Kusatsu
Kusatsu, Gunma, Japan, experiences significant temperature variation throughout the year. Summers bring daytime highs of 28°C (82°F) in August, while winters cool to 2°C (36°F) in January.
With around 1787 mm (70 in) of annual rain/snowfall, Kusatsu has a notably wet climate. However, this rain/snowfall is not evenly distributed — the city has a distinct rainy season from June to September, with warm summers and cold winters. The wettest month is July. Sunshine peaks in May, when the city sees around 7.0 hours of sunshine per day.
Kusatsu Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Kusatsu - and find the best time to visit.
Monthly Temperature in Kusatsu
Depending on the time of the year, temperatures range from comfortable to chilly in Kusatsu. Average daytime temperatures reach a comfortable 28°C (82°F) in August. In January, the coolest month of the year, temperatures drop to a chilly 2°C (36°F).
At night, temperatures range from around 19°C (66°F) in August to -6°C (21°F) in January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Kusatsu
Kusatsu has a relatively rain/snowy climate with high precipitation levels, averaging 1787 mm (70 in) of rain/snowfall annually. Kusatsu can be quite wet during July, receiving approximately 244 mm (9.6 in) of precipitation over 23 rainy days.
In contrast, during the driest month (November), you will experience much drier conditions, with 90 mm (3.5 in) of precipitation spread across 16 rainy days. For more details, please visit our Kusatsu 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 Kusatsu
Kusatsu experiences moderate variation in sunshine hours across the seasons. With 7.0 hours daily sunshine in May, it dips to 4.3 hours in January, offering a balanced mix of sunny and overcast days.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Kusatsu by Month
The relative humidity is high throughout the year in Kusatsu.
The city experiences its highest humidity in January, reaching 78%. In April, the humidity drops to its lowest level at 61%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Kusatsu
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May
- Warmest weather: July and August
- Most sunshine: May and August
- Fewer rainy days: April, May, October, November and December
- Seasonal pattern: A distinct rainy season from June to September, with warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Kusatsu
What is the best time to visit Kusatsu?
May typically offers the most optimal weather in Kusatsu. In contrast, January, February, March and December tend to have less optimal conditions. Kusatsu has a distinct rainy season from June to September, with warm summers and cold winters.
What temperatures can I expect in Kusatsu?
Daytime highs range from 2°C (36°F) in January to 28°C (82°F) in August. Nighttime lows range from -6°C (21°F) to 19°C (66°F). Temperatures vary considerably through the year.
How much rain does Kusatsu get?
Annual rainfall is around 1787 mm (70 in). July is the wettest month with 244 mm (9.6 in), while November is the driest with 90 mm (3.5 in).
How sunny is Kusatsu?
Kusatsu receives around 1,951 hours of sunshine per year. May is the sunniest month with 209 hours, while January is the cloudiest with just 128 hours.
Kusatsu 3-Day Forecast
Kusatsu 3-Day Forecast
Kusatsu on the map
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Popular this month
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