Climate Overview
The climate in Minamiuonuma is temperate. The average annual temperature is 10°C and approximately 2528mm of precipitation falls per year. Minamiuonuma receives a notable amount of rainfall throughout the year, including during its driest month. Minamiuonuma 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 -6°C. Minamiuonuma experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Minamiuonuma vary considerably across the year, with a 34°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 -6°C and the daily average is -3°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between September and October, with a 7°C shift in average temperatures.
Precipitation
Minamiuonuma is a very wet location, receiving approximately 2528mm of precipitation annually, which averages out to around 211mm per month. The wettest month is July, averaging 302mm of rainfall. August and September also tend to see above-average precipitation. The driest month is April, with just 159mm. That's 142mm 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. Minamiuonuma receives heavy snowfall, accumulating around 650cm annually from January through December. The snowiest month is January, with approximately 192cm. Winter travel should account for significant snow cover.
Wind
Minamiuonuma is relatively calm, with an average annual wind speed of 6km/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 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 5km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.
Seasons
7 days until Autumn
It is currently summer in Minamiuonuma, which began on June 21, 2026. Minamiuonuma 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 -6°C. Autumn is next, beginning on September 23, 2026 (7 days from now).
Spring
Temperatures range from -1 to 20°C. Rainfall is heavy, totalling around 493mm across the season with a monthly average of 164mm. Winds are generally light, averaging 7km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 15 to 28°C. Rainfall is heavy, totalling around 766mm across the season with a monthly average of 255mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal. Perfect conditions for outdoor activities.
Autumn
Temperatures range from 3 to 24°C. Rainfall is heavy, totalling around 630mm across the season with a monthly average of 210mm. Expect around 36cm of snow accumulation during this period. Winds are generally light, averaging 6km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -6 to 4°C. Rainfall is heavy, totalling around 639mm across the season with a monthly average of 213mm. Expect around 506cm of snow accumulation during this period. Winds are generally light, averaging 6km/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 Minamiuonuma 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.
