Current date: 2025-12-22 (JST)
What Happened
After a period of unusually high temperatures across Japan, a significant cold wave is expected to arrive around the end of the year. 1 The shift follows a weekend where some areas in the Tohoku region experienced their warmest December days on record. This sudden change is due to a strong cold air mass moving south over the country.
Why This Matters for Travelers
This forecast is important for anyone traveling in Japan during the last week of December. The sharp drop in temperature will require a quick change in clothing, from lighter jackets to heavy winter wear.
Travelers on the Japan Sea coast, from Hokkaido to the Chugoku region, should prepare for heavy snow. Even in the Kanto region, including Tokyo, there is a possibility of cold rain or even snow in inland areas around December 28th. 1 This could affect transportation and outdoor plans.
Expected Timeline of the Cold Wave
The current forecast suggests the weather will change significantly after Christmas.
| Date | Expected Weather | Regions Affected |
| Dec 22-25 | Mild, warmer than average | Most of Japan |
| Dec 26 onwards | Sharp temperature drop, strong cold air | Nationwide |
| Dec 28 (approx.) | Potential for heavy snow on Japan Sea side; cold rain or snow in Kanto | Japan Sea coast, Northern Japan, Kanto |
What to Expect
•Temperature Drop: Tokyo’s maximum temperature may not reach 10°C over the final weekend of the year. 1
•Snow: The Japan Sea side is likely to see significant snowfall. This can lead to train delays or cancellations. Check transport operators’ websites for the latest updates.
•Sudden Changes: The contrast between the recent warmth and the incoming cold will be severe. This increases the risk of catching a cold, so managing body temperature is important.
Practical Notes
•Clothing: Pack layers. A warm base layer, a fleece or sweater, and a windproof/waterproof outer jacket are recommended. Gloves, a hat, and a scarf will be necessary.
•Transport: If traveling by train or plane to or from the Japan Sea coast, allow for extra time and be prepared for potential delays.
•Check Forecasts: Weather conditions can change. Check the Japan Meteorological Agency (JMA) forecast daily.
Official Information
This information is based on analysis from weather experts interpreting data from the Japan Meteorological Agency. The primary source is a forecast article by a certified weather forecaster. 1
Summary
Japan is set for a dramatic weather shift at the end of 2025. After record-breaking warmth, a strong cold wave will bring winter conditions nationwide from December 26th. Travelers should prepare for a significant temperature drop and potential heavy snow, especially along the Japan Sea coast. Check forecasts daily and adjust travel plans if needed.
Sources / References
Notes & Limitations
•This is a forecast and the exact timing and intensity of the cold wave may change.
•The possibility of snow in Tokyo is low but not zero; it is more likely to be a cold rain.
