Climate Insights for Minamisanriku

The climate in Minamisanriku is temperate. The average annual temperature is 13°C and approximately 1219mm of precipitation falls per year. Minamisanriku receives a notable amount of rainfall throughout the year, including during its driest month. Minamisanriku 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. Light snow can occur between January and December.

Temperatures in Minamisanriku vary considerably across the year, with a 26°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 27°C and the mean temperature sits around 25°C. January is the coolest month, with minimum temperatures around 1°C and an average of 3°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between September and October, with a 6°C shift in average temperatures.

Minamisanriku is a fairly wet location, receiving approximately 1219mm of precipitation annually, which averages out to around 102mm per month. The wettest month is August, averaging 161mm of rainfall. September and July also tend to see above-average precipitation. The driest month is February, with just 42mm. That's 119mm less than August, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall. Light snowfall can occur between January and December, totalling around 24cm annually. January is the snowiest month with approximately 9cm.

Minamisanriku is moderately windy, with an average annual wind speed of 23km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 29km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in July, with average winds dropping to 16km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 13km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 28km/h in winter, 23km/h in spring, 18km/h in summer, 22km/h in autumn.

It is currently spring in Minamisanriku, which began on March 20, 2026. Minamisanriku 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 27°C, while the coldest stretch bottoms out in January near 1°C. Summer is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Minamisanriku is during May, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 99mm per month. By contrast, August can be uncomfortably hot with highs reaching 27°C, while January is the coldest period with lows dropping to 1°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Minamisanriku 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.