Weather in Kōyasan for August 2026
Until now, August 2026 in Kōyasan has been nearly identical to the historical average, with a temperature of 31 °C (showing only a slight deviation of 0.1 °C).
The forecast for the next days in Kōyasan predicts temperatures to be around 29 °C, close to the historical average.
In general, the average temperature in Kōyasan at the beginning of August is 32.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 29.3 °C by the end of August.
Kōyasan experiences heavy rainfall in August, with over 20 rainy days and an average total precipitation 258 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 | 33° /22° | 0.8 mm | 10 | |
| 2 Aug. |  Partly cloudy | 33° /22° | 1.5 mm | 10 | |
| 3 Aug. |  Patchy light drizzle | 33° /21° | 3.6 mm | 7 | |
| 4 Aug. |  Sunny | 33° /22° | 0.6 mm | 7 | |
| 5 Aug. |  Patchy light rain with thunder | 33° /21° | 0.4 mm | 10 | |
| 6 Aug. | Patchy rain possible | 33° /23° | 2.5 mm | 10 | |
| 7 Aug. |  Moderate or heavy rain shower | 30° /21° | 9.9 mm | 9 | |
| 8 Aug. | Patchy rain possible | 32° /19° | 1.8 mm | 10 | |
| 9 Aug. | Light rain shower | 31° /21° | 3.1 mm | 6 | |
| 10 Aug. | Light rain shower | 29° /21° | 4.1 mm | 6 | |
| 11 Aug. | Moderate or heavy rain shower | 27° /19° | 20.7 mm | 8 | |
| 12 Aug. | Light rain shower | 28° /21° | 32.6 mm | 5 | |
| 13 Aug. | Patchy rain possible | 30° /20° | 3 mm | 7 | |
| 14 Aug. | Light rain shower | 31° /19° | 6.2 mm | 9 | |
| 15 Aug. | Patchy rain possible | 31° /20° | 4 mm | 9 | |
| 16 Aug. | Light rain shower | 30° /20° | 6.2 mm | 9 | |
| 17 Aug. | Patchy light drizzle | 30° /20° | 6 mm | 5 | |
| 18 Aug. | Patchy light rain with thunder | 31° /21° | 10.7 mm | 5 | |
| 19 Aug. | Patchy rain possible | 30° /21° | 6.1 mm | 6 | |
| 20 Aug. |  Heavy rain at times | 30° /22° | 22.5 mm | 7 | |
| 21 Aug. | Patchy rain possible | 30° /23° | 0.9 mm | 9.5 | |
| 22 Aug. |  Overcast | 30° /23° | 0.1 mm | 9 | |
| 23 Aug. | Sunny | 30° /23° | 3.2 mm | 8 | |
| 24 Aug. | Patchy rain possible | 29° /23° | 2.1 mm | 8 | |
| 25 Aug. | Sunny | 30° /23° | 3.5 mm | 7 | |
| 26 Aug. | Patchy rain possible | 24° /22° | 1.6 mm | 5 | |
| 27 Aug. | Light rain shower | 25° /21° | 10.6 mm | 5 | |
| 28 Aug. | Patchy rain possible | 31° /24° | 1.2 mm | 7 | |
| 29 Aug. | Sunny | 32° /24° | 0.9 mm | 8 | |
| 30 Aug. | Sunny | 31° /24° | 0.1 mm | 8 | |
| 31 Aug. | Sunny | 32° /23° | 0.1 mm | 8 | |
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Kōyasan weather in August vs July vs September
| July | August | September | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 31°/20° | 31°/21° | 29°/19° |
| Rainfall | 161 mm | 258 mm | 114 mm |
| Wind | 8.9 km/h | 11.3 km/h | 9.3 km/h |
| Humidity | 77% | 78% | 79% |
| Rainy days | 26 days | 26 days | 19 days |
| Dry days | 5 days | 5 days | 11 days |
Planning a trip to Kōyasan? Discover the best time to visit
Kōyasan in August - FAQ
What are the expected maximum and minimum temperatures in Kōyasan during August?
How much rainfall should be expected in Kōyasan during August?
What are the typical wind conditions in Kōyasan during August?
August rainfall patterns in Kōyasan
UV exposure in Kōyasan during August
What to pack to Kōyasan in August?
Warm & sunny · highs around 31 °C, frequent showers
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
👟 Footwear
🎒 Accessories
🧴 Personal Items
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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.