Weather in Kōyasan for December 2025
With an average of 3 snowy days, Kōyasan usually enjoys a light touch of snow in December.
In general, the average temperature in Kōyasan at the beginning of December is 11.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 7.3 °C by the end of December.
The climate of Kōyasan in December is notably wet, with an average of 12 rainy days, and a total of 35.6 mm of precipitation.
Is December a good time to visit Kōyasan? check out the best time to travel to Kōyasan page.
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Kōyasan Weather December
Temperatures trend during December in Kōyasan
December weather in Kōyasan day by day
| Date | Weather | Temperatures | Rain | Snow | More |
|---|---|---|---|---|---|
| 1 Dec. |  Cloudy | 12° /4° | 0 mm | 0 cm | |
| 2 Dec. |  Sunny | 14° /3° | 0 mm | 0 cm | |
| 3 Dec. |  Overcast | 16° /5° | 0 mm | 0 cm | |
| 4 Dec. | Cloudy | 11° /4° | 0 mm | 0 cm | |
| 5 Dec. |  Patchy rain possible | 10° /3° | 0.3 mm | 0 cm | |
| 6 Dec. | Patchy rain possible | 10° /4° | 0.8 mm | 0 cm | |
| 7 Dec. | Overcast | 9° /3° | 0.2 mm | 0 cm | |
| 8 Dec. | Patchy rain possible | 7° /1° | 1.6 mm | 0 cm | |
| 9 Dec. | Cloudy | 7° /1° | 0 mm | 0 cm | |
| 10 Dec. | Patchy rain possible | 8° /0° | 0.2 mm | 0 cm | |
| 11 Dec. | Patchy rain possible | 10° /2° | 0.1 mm | 0 cm | |
| 12 Dec. | Cloudy | 7° /0° | 0 mm | 0 cm | |
| 13 Dec. | Overcast | 10° /0° | 0 mm | 0 cm | |
| 14 Dec. |  Moderate or heavy rain shower | 5° /-1° | 8.8 mm | 1.2 cm | |
| 15 Dec. | Patchy rain possible | 7° /0° | 2.1 mm | 0.9 cm | |
| 16 Dec. | Patchy rain possible | 7° /2° | 1.6 mm | 0 cm | |
| 17 Dec. | Overcast | 9° /1° | 0 mm | 0 cm | |
| 18 Dec. | Overcast | 7° /1° | 0 mm | 0 cm | |
| 19 Dec. |  Light freezing rain | 5° /0° | 1.6 mm | 0 cm | |
| 20 Dec. | Overcast | 7° /-1° | 0 mm | 0 cm | |
| 21 Dec. |  Heavy rain at times | 10° /0° | 3.7 mm | 0 cm | |
| 22 Dec. | Heavy rain at times | 5° /0° | 4.6 mm | 0 cm | |
| 23 Dec. | Patchy rain possible | 6° /-1° | 1.7 mm | 0 cm | |
| 24 Dec. | Moderate rain at times | 7° /0° | 3.1 mm | 0 cm | |
| 25 Dec. |  Partly cloudy | 9° /0° | 0 mm | 0 cm | |
| 26 Dec. | Patchy rain possible | 10° /3° | 2.1 mm | 0 cm | |
| 27 Dec. | Overcast | 7° /2° | 0.1 mm | 0 cm | |
| 28 Dec. | Patchy rain possible | 5° /1° | 0.8 mm | 0 cm | |
| 29 Dec. | Patchy rain possible | 5° /0° | 0.5 mm | 0 cm | |
| 30 Dec. | Partly cloudy | 8° /-1° | 0 mm | 0 cm | |
| 31 Dec. | Light rain shower | 7° /0° | 1.7 mm | 0.3 cm | |
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Kōyasan in December - FAQ
What to pack to Kōyasan in December?
As you prepare for your trip to Kōyasan in December, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Kōyasan, during December, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
Kōyasan snow forecast December 2025
December rainfall patterns in Kōyasan
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Where is Kōyasan?Get accurate weather forecasts for Kōyasan, located at latitude 34.217 and longitude 135.583. Stay updated with localized weather information tailored for Kōyasan.