Climate Insights for Ōshū

The climate in Ōshū is temperate. The average annual temperature is 11°C and approximately 1321mm of precipitation falls per year. Ōshū receives a notable amount of rainfall throughout the year, including during its driest month. Ōshū 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. Snowfall occurs from January to December, with around 149cm accumulating over the season.

Temperatures in Ōshū 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.

Ōshū is a fairly wet location, receiving approximately 1321mm of precipitation annually, which averages out to around 110mm per month. The wettest month is August, averaging 173mm of rainfall. July and September also tend to see above-average precipitation. The driest month is February, with just 61mm. That's 112mm 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. Snowfall is a regular feature from January to December, with around 149cm accumulating over the season. January typically sees the most snow at around 43cm.

Ōshū is relatively calm, with an average annual wind speed of 9km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 6km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/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 10km/h in winter, 10km/h in spring, 7km/h in summer, 8km/h in autumn.

It is currently summer in Ōshū, which began on June 21, 2026. Ōshū 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).

The table below shows monthly climate averages for Ōshū 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.