Visit Eastern Hokkaido

Monthly temperatures and what to pack

Eastern Hokkaido often feels colder than the temperature suggests due to coastal winds and sea fog. Use the monthly averages below as a starting point, then add layers if you are heading to higher altitudes (e.g., Shiretoko, Akan, Mashu).

Monthly average temperature (°C)

Spring (April – May)

Characteristics: While days can be pleasant with sunshine, temperatures often drop sharply in the mornings and evenings. Coastal areas are prone to wind chill, making it feel much colder than the actual temperature.

Clothing: Layering is essential. A thin down vest or a warm fleece paired with a windproof jacket is recommended. Carry an extra middle layer for the evening. Waterproof shoes are highly advised; during the snowmelt season, roads become slushy and muddy. If your feet get wet, your body temperature will drop rapidly.

Summer (June – August)

Characteristics: Coastal areas in Eastern Hokkaido tend to be cool due to sea fog and wind. However, temperatures can occasionally exceed 30°C (86°F) depending on the conditions. Relying solely on “cool weather” clothing may leave you unprepared for sudden heat.

Clothing: Stick to light layering (T-shirts plus a thin long-sleeve shirt) and a lightweight windbreaker. A light jacket is a must even in summer for visits to capes, observatories, or boat tours where winds are strong. Prepare for potential heat with breathable fabrics and hats, and ensure your outfit is easy to adjust. If hiking, add rain gear and insect repellent to your kit.

Autumn (September – November)

Characteristics: Temperatures drop rapidly during this period, and nights become particularly cold. Expect an increase in wind and rain.

Clothing: A warm middle layer (fleece or thin down) combined with a windproof and waterproof shell is the standard. From October to November, gloves and knit hats are recommended for comfort. For footwear, prioritize waterproof materials and non-slip soles.

Winter (December – March)

Characteristics: Strong winds often create severe wind chill. Temperatures can plummet well below freezing, sometimes reaching -20°C (-4°F) or lower. A single standard winter coat is often insufficient for these conditions.

Clothing: Full thermal gear is required. Layering should include thermal base layers, a thick middle layer (such as heavy fleece), an insulating layer (down), and a windproof outer shell. A knit hat, gloves, and a neck warmer are mandatory. For footwear, use waterproof thermal boots with ice grips. To survive -20°C conditions, minimize skin exposure by using heavy-duty insulation, overpants, mittens, and a face cover.