Winter really sets in in January, so you will need a snug-fitting undergarment, shirt, wool sweater, and a thick long coat or down jacket. Many women wearing skirts wear thick tights or boots to fight off the cold. As for men, there is no need to wear extra clothing under their trousers.

January in Osaka is characterized by a "dry cold," with average temperatures ranging from 3°C to 10°C (37°F to 50°F). The most effective 2026 strategy is layered clothing because indoor heating on trains and in malls is often very intense, creating a sharp contrast with the chilly outdoors. Your base layer should be moisture-wicking (like UNIQLO's Heattech), followed by a middle layer like a fleece or wool sweater. Your outer layer must be a windproof down jacket or heavy wool coat to block the biting winter winds. Don't forget accessories: a scarf, gloves, and a knit hat are "must-haves" for evening walks. For footwear, comfortable sneakers or boots with warm socks are essential for navigating the city's walkable districts like Dotonbori. A peer-to-peer "pro-tip": purchase "Kairo" (disposable heat packs) from a local Japanese convenience store; they are life-savers when slipped into your pockets or shoes during long days of sightseeing.