Weather in Kōyasan for August 2025
Until now, August 2025 in Kōyasan has been nearly identical to the historical average, with a temperature of 30.3 °C (showing only a slight deviation of 0 °C).
The forecast for the next days in Kōyasan predicts temperatures to be around 31 °C, close to the historical average.
In general, the average temperature in Kōyasan at the beginning of August is 31.9 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 31.1 °C by the end of August.
Kōyasan experiences heavy rainfall in August, with over 20 rainy days and an average total precipitation 313.1 mm.
Is August a good time to visit Kōyasan? check out the best time to travel to Kōyasan page.
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Kōyasan Weather August
Temperatures trend during August in Kōyasan
August weather in Kōyasan day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. |  Patchy rain possible | 31° /22° | 1.6 mm | 7 | |
| 2 Aug. |  Partly cloudy | 33° /21° | 0 mm | 8 | |
| 3 Aug. |  Patchy light drizzle | 33° /20° | 1.3 mm | 7 | |
| 4 Aug. |  Sunny | 34° /22° | 0 mm | 8 | |
| 5 Aug. |  Patchy light rain with thunder | 33° /22° | 0.8 mm | 7 | |
| 6 Aug. | Patchy rain possible | 33° /23° | 1.9 mm | 7 | |
| 7 Aug. |  Moderate or heavy rain shower | 26° /20° | 16.5 mm | 6 | |
| 8 Aug. | Patchy rain possible | 30° /19° | 0.9 mm | 7 | |
| 9 Aug. | Light rain shower | 30° /20° | 3.2 mm | 7 | |
| 10 Aug. | Light rain shower | 26° /20° | 6.5 mm | 6 | |
| 11 Aug. | Moderate or heavy rain shower | 24° /20° | 41.3 mm | 5 | |
| 12 Aug. | Light rain shower | 29° /22° | 6.8 mm | 6 | |
| 13 Aug. | Patchy rain possible | 31° /21° | 2.3 mm | 7 | |
| 14 Aug. | Light rain shower | 30° /21° | 7 mm | 7 | |
| 15 Aug. | Patchy rain possible | 32° /21° | 2.4 mm | 7 | |
| 16 Aug. | Light rain shower | 30° /20° | 11.4 mm | 7 | |
| 17 Aug. | Patchy light drizzle | 30° /20° | 4 mm | 7 | |
| 18 Aug. | Patchy light rain with thunder | 31° /20° | 18.9 mm | 7 | |
| 19 Aug. | Patchy rain possible | 33° /20° | 2.8 mm | 2.4 | |
| 20 Aug. | Patchy rain possible | 33° /20° | 1.6 mm | 2.5 | |
| 21 Aug. |  Moderate rain | 30° /20° | 10 mm | 2.4 | |
| 22 Aug. | Moderate rain | 30° /20° | 8 mm | 2.1 | |
| 23 Aug. | Moderate rain | 31° /20° | 5.1 mm | 5 | |
| 24 Aug. | Patchy rain possible | 31° /21° | 0.1 mm | 5 | |
| 25 Aug. | Patchy rain possible | 31° /22° | 0.4 mm | 6 | |
| 26 Aug. | Patchy rain possible | 30° /22° | 1.3 mm | 6 | |
| 27 Aug. | Patchy rain possible | 30° /22° | 0.4 mm | 5 | |
| 28 Aug. | Sunny | 31° /20° | 0 mm | 7 | |
| 29 Aug. | Sunny | 32° /21° | 0 mm | 7 | |
| 30 Aug. | Partly cloudy | 32° /21° | 0 mm | 7 | |
| 31 Aug. | Sunny | 32° /19° | 0 mm | 7 | |
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Kōyasan in August - FAQ
What to pack to Kōyasan in August?
As you prepare for your trip to Kōyasan in August, 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 August, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Lightweight Clothing: T-shirts, blouses, shorts, skirts
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Sandals/Flip-flops: Comfortable for warm climates
- Accessories
- Sunglasses: For sun protection
- Sun Hats: Wide-brimmed hats for sun protection in warm weather
- Umbrellas/Raincoats: For rainy days
- Personal Items
- Sunscreen: High SPF for sunny destinations
- Lip Balm with SPF: To protect against chapped lips
- Insect Repellent: For destinations with mosquitos or other insects
August rainfall patterns in Kōyasan
UV exposure in Kōyasan during August
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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.