Climate Overview
The climate in Katsuyama is temperate. The average annual temperature is 12°C and approximately 2622mm of precipitation falls per year. Katsuyama receives a notable amount of rainfall throughout the year, including during its driest month. Katsuyama is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are January, February, December, when temperatures can drop to -4°C. Katsuyama experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Katsuyama vary considerably across the year, with a 32°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 28°C and the mean temperature sits around 24°C. The coldest month is January, when overnight lows fall to -4°C and the daily average is -1°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.
Precipitation
Katsuyama is a very wet location, receiving approximately 2622mm of precipitation annually, which averages out to around 218mm per month. The wettest month is July, averaging 360mm of rainfall. June and August also tend to see above-average precipitation. The driest month is November, with just 154mm. That's 205mm less than July, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Katsuyama receives heavy snowfall, accumulating around 337cm annually from January through December. The snowiest month is January, with approximately 112cm. Winter travel should account for significant snow cover.
Wind
Katsuyama is relatively calm, with an average annual wind speed of 8km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is April, averaging 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 7km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.
Seasons
3 days until Autumn
It is currently summer in Katsuyama, which began on June 21, 2026. Katsuyama is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 28°C, while the coldest stretch bottoms out in January near -4°C. Autumn is next, beginning on September 23, 2026 (3 days from now).
Spring
Temperatures range from 1 to 19°C. Rainfall is heavy, totalling around 591mm across the season with a monthly average of 197mm. Winds are generally light, averaging 9km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 16 to 28°C. Rainfall is heavy, totalling around 887mm across the season with a monthly average of 296mm. Winds are generally light, averaging 7km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 4 to 25°C. Rainfall is heavy, totalling around 594mm across the season with a monthly average of 198mm. Expect around 10cm of snow accumulation during this period. Winds are generally light, averaging 8km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -4 to 5°C. Rainfall is heavy, totalling around 550mm across the season with a monthly average of 183mm. Expect around 278cm of snow accumulation during this period. Winds are generally light, averaging 9km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Monthly Climate Data
The table below shows monthly climate averages for Katsuyama based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.
