Climate Overview
The climate in Hamatonbetsu is cool. The average annual temperature is 6°C and approximately 1214mm of precipitation falls per year. Hamatonbetsu receives a notable amount of rainfall throughout the year, including during its driest month. Hamatonbetsu 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 February, January, December, when temperatures can drop to -9°C. Hamatonbetsu experiences heavy snowfall, typically from January through December.
Temperature
Temperatures in Hamatonbetsu vary considerably across the year, with a 30°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 21°C with a mean of 19°C. The coldest month is February, when overnight lows fall to -9°C and the daily average is -6°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between October and November, with a 8°C shift in average temperatures.
Precipitation
Hamatonbetsu is a fairly wet location, receiving approximately 1214mm of precipitation annually, which averages out to around 101mm per month. The wettest month is August, averaging 195mm of rainfall. July and November also tend to see above-average precipitation. The driest month is February, with just 59mm. That's 135mm 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. Hamatonbetsu receives heavy snowfall, accumulating around 343cm annually from January through December. The snowiest month is December, with approximately 82cm. Winter travel should account for significant snow cover.
Wind
Hamatonbetsu is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 6km/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 2km/h gap between the calmest and windiest months.
Seasons
91 days until Autumn
It is currently summer in Hamatonbetsu, which began on June 21, 2026. Hamatonbetsu 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 21°C, while the coldest stretch bottoms out in February near -9°C. Autumn is next, beginning on September 23, 2026 — 91 days from now.
Spring
Temperatures range from -3 to 13°C. Precipitation is moderate at around 215mm for the season, averaging 72mm per month. Winds are generally light, averaging 5km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 11 to 21°C. Rainfall is heavy, totalling around 433mm across the season with a monthly average of 144mm. Winds are generally light, averaging 4km/h. Comfortable clothing with a light layer for cooler evenings is all you need.
Autumn
Temperatures range from 1 to 19°C. Rainfall is heavy, totalling around 338mm across the season with a monthly average of 113mm. Expect around 54cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from -9 to -1°C. Precipitation is moderate at around 228mm for the season, averaging 76mm per month. Expect around 213cm of snow accumulation during this period. Winds are generally light, averaging 5km/h. Warm winter clothing and waterproof boots are a must, and travel may be affected by snow.
Best Time to Visit
The best time to visit Hamatonbetsu is during September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 17°C with modest rainfall averaging 99mm per month. By contrast, August can be uncomfortably hot with highs reaching 21°C, while February is the coldest period with lows dropping to -9°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.
Monthly Climate Data
The table below shows monthly climate averages for Hamatonbetsu 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.
