Climate Insights for Ōmachi

The climate in Ōmachi is cool. The average annual temperature is 7°C and approximately 3252mm of precipitation falls per year. Ōmachi receives a notable amount of rainfall throughout the year, including during its driest month. Ōmachi 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 -11°C. Ōmachi experiences heavy snowfall, typically from January through December.

Temperatures in Ōmachi vary considerably across the year, with a 35°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 24°C with a mean of 20°C. The coldest month is January, when overnight lows fall to -11°C and the daily average is -7°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between November and December, with a 7°C shift in average temperatures.

Ōmachi is a very wet location, receiving approximately 3252mm of precipitation annually, which averages out to around 271mm per month. The wettest month is July, averaging 489mm of rainfall. August and June also tend to see above-average precipitation. The driest month is November, with just 175mm. That's 314mm 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. Ōmachi receives heavy snowfall, accumulating around 753cm annually from January through December. The snowiest month is January, with approximately 188cm. Winter travel should account for significant snow cover.

Ōmachi 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 February, averaging 7km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/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 7km/h in winter, 6km/h in spring, 5km/h in summer, 5km/h in autumn.

It is currently summer in Ōmachi, which began on June 21, 2026. Ōmachi 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 24°C, while the coldest stretch bottoms out in January near -11°C. Autumn is next, beginning on September 23, 2026 (3 days from now).

The table below shows monthly climate averages for Ōmachi 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.