Kusatsu Temperature by Month

Kusatsu in Gunma, Japan sees significant seasonal temperature differences, with daytime highs between 2°C (36°F) in January and 28°C (82°F) in August, averaging 15°C (59°F) annually. Explore the full monthly breakdown below.

Depending on the time of the year, temperatures range from comfortable to cold in Kusatsu. At night, minimum temperatures range from 19°C (66°F) in August to -6°C (21°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Kusatsu by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM. August, the warmest month, sees 206 hours of sunshine.

The chart below shows the average temperature throughout the year:

Kusatsu's average annual maximum temperature is 15°C (59°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

New York City, USA averages 17°C (63°F) a year, with hot humid summers and cold winters that bring regular snowfall.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.

In Kusatsu, January is the coolest month, with average highs of 2°C (36°F) and humidity around 78%, considered high. In August, the warmest month, temperatures average 28°C (82°F) with 72% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Kusatsu this rarely lasts long on the ground.

For more on Kusatsu's weather, including monthly rainfall, sunshine hours, and humidity, visit our Kusatsu climate page.