In 2026, Japan's winter temperatures vary dramatically by latitude. In the northern island of Hokkaido, winter is severe, with temperatures in cities like Sapporo frequently dropping to -12°C to -6°C (10°F to 21°F) in January, accompanied by heavy snow. In central cities like Tokyo, Kyoto, and Osaka, the weather is typically crisp, dry, and sunny; daytime highs average 8°C to 12°C (46°F to 54°F), while nighttime lows hover near 1°C to 4°C (34°F to 39°F). Southern regions like Kyushu stay milder, with highs around 13°C (55°F), while the subtropical islands of Okinawa remain very comfortable, with average temperatures between 16°C and 21°C (61°F to 70°F). Regardless of where you visit, the lack of humidity in the major cities can make the air feel much "sharper" than the thermometer suggests, so high-quality thermal layers are essential.