Hokkaido’s climate differs fundamentally from the rest of Japan. The island sits at latitudes comparable to southern France or the northern United States, but its position between the Sea of Japan and the Pacific Ocean creates weather patterns unique in Japan: genuine four-season variation, subarctic winters, comfortable summers without the debilitating humidity that characterises the rest of the country, and a near-total absence of the tsuyu (rainy season) that affects Honshu from June through July.
Understanding Hokkaido’s climate is essential for trip planning — the difference between January and July is not merely one of temperature but of entirely different landscapes, activities, and experiences.
Monthly Overview: Sapporo
| Month | Avg High | Avg Low | Rain/Snow | Conditions |
|---|---|---|---|---|
| January | -1°C | -8°C | 110cm snow | Deep winter, heavy snow, coldest period |
| February | 0°C | -8°C | 95cm snow | Cold, Snow Festival, peak ski |
| March | 4°C | -4°C | 60cm snow | Late winter, spring skiing begins |
| April | 11°C | 2°C | 55mm rain | Snow melting, early spring |
| May | 17°C | 7°C | 55mm rain | Cherry blossoms, pleasant |
| June | 21°C | 12°C | 50mm rain | Early summer, no rainy season |
| July | 25°C | 17°C | 80mm rain | Warm, lavender season |
| August | 26°C | 18°C | 120mm rain | Warmest month, comfortable |
| September | 22°C | 13°C | 135mm rain | Early autumn, foliage starts in mountains |
| October | 15°C | 6°C | 110mm rain | Peak foliage, cooling rapidly |
| November | 7°C | 0°C | 50cm snow | First snow, transition to winter |
| December | 1°C | -5°C | 100cm snow | Winter begins, ski season opens |
Regional Variations
Hokkaido is large enough that weather conditions vary significantly between regions.
Sea of Japan Side (Sapporo, Otaru, Niseko)
The heaviest snowfall in Hokkaido. Cold air from Siberia absorbs moisture crossing the Sea of Japan and deposits it as snow on the western mountains. Niseko receives 14–15 metres of annual snowfall; Sapporo approximately 5 metres. Summers are warm and pleasant with occasional rain.
Interior (Asahikawa, Furano, Biei)
The coldest temperatures in Hokkaido. Asahikawa regularly records Japan’s lowest winter temperatures, occasionally dropping below -25°C. The interior receives less snow than the Sea of Japan coast but what falls stays frozen longer. Summers are warm during the day but cool significantly at night.
Pacific Side (Kushiro, Obihiro, Tokachi)
Less snow than the western side, but fog is common along the Pacific coast, particularly in summer. The Tokachi region inland is sunnier and drier. Summer temperatures are cooler than Sapporo, rarely exceeding 22°C along the coast. Winter is cold and dry with clear skies more common than on the Japan Sea side.
Sea of Okhotsk (Abashiri, Shiretoko)
Cold and windswept. This coast receives drift ice from late January through March — a natural phenomenon unique to this part of Japan. Winter temperatures are severe (-15°C to -20°C not uncommon), and the wind chill factor off the frozen ocean amplifies the cold considerably. Summer is cool, with temperatures rarely exceeding 20°C.
What to Wear
Winter (December–March)
- Insulated waterproof outer jacket (not a fashion coat)
- Thermal base layers (merino wool or Uniqlo HEATTECH)
- Waterproof boots with proper winter grip (essential — sidewalks are ice)
- Warm hat, insulated gloves, scarf
- Multiple mid-layers for indoor/outdoor transitions
- Clip-on ice grips for shoes (available at convenience stores, ¥1,000–2,000)
Summer (June–August)
- Light layers — T-shirt, light long sleeve, thin jacket
- Rain jacket (August has the most rainfall)
- Comfortable walking shoes
- Sun protection for outdoor activities
- Insect repellent for hiking and camping
Spring and Autumn (April–May, September–November)
- Layering system — temperatures can swing 10–15°C within a day
- Medium-weight jacket
- Late November: transition to winter gear
When to Visit
Detailed month-by-month recommendations, including events, seasonal food, and crowd levels, are available in our seasonal guides: