Climate Insights for Yamagata

The climate in Yamagata is temperate. The average annual temperature is 14°C and approximately 2688mm of precipitation falls per year. Yamagata receives a notable amount of rainfall throughout the year, including during its driest month. Yamagata 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 -1°C. Snowfall occurs from January to December, with around 97cm accumulating over the season.

Temperatures in Yamagata 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 31°C and the mean temperature sits around 26°C. The coldest month is January, when overnight lows fall to -1°C and the daily average is 2°C. Daily temperature variation is modest, with an average difference of 8°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Yamagata is a very wet location, receiving approximately 2688mm of precipitation annually, which averages out to around 224mm per month. The wettest month is July, averaging 460mm of rainfall. September and June also tend to see above-average precipitation. The driest month is November, with just 95mm. That's 365mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Snowfall is a regular feature from January to December, with around 97cm accumulating over the season. January typically sees the most snow at around 37cm.

Yamagata is relatively calm, with an average annual wind speed of 2km/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 3km/h, though still comfortable for most outdoor activities. The calmest conditions occur in August, with average winds dropping to 2km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 1km/h gap between the calmest and windiest months.

It is currently summer in Yamagata, which began on June 21, 2026. Yamagata 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 31°C, while the coldest stretch bottoms out in January near -1°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The table below shows monthly climate averages for Yamagata 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.