Winter, December to February
The clearest season and the coldest. Insulated jacket, gloves, hat, thermal base layer and grippy shoes. Lakeshore wind at sunrise feels far colder than the forecast number, and Chureito steps can be icy.
Practical
Fuji sits in its own weather system. The base can be mild while the summit is below freezing, and a clear sunrise is usually the coldest hour of your trip. Pack for the season you are actually visiting.
The clearest season and the coldest. Insulated jacket, gloves, hat, thermal base layer and grippy shoes. Lakeshore wind at sunrise feels far colder than the forecast number, and Chureito steps can be icy.
Big daily swings. Light down or fleece plus a windproof shell, and a thin scarf for early mornings. Sakura weeks bring rain showers, so a compact umbrella earns its space.
Humid and hazy at the base, cold on the summit. Breathable shirts, sun hat, sunscreen and a proper rain shell for tsuyu. If you climb, add fleece, hard shell, headlamp and gloves.
The best balance. Mid layer plus shell, long trousers for evening, and a lens cloth: maple season mornings are damp and often start with mist over the lakes.