Weather in Karuizawa for August 2026
Expect cooler weather in first days of August 2026 in Karuizawa with the forecast suggesting a temperature of 29.1 °C, lower than the historical average.
In general, the average temperature in Karuizawa at the beginning of August is 27.7 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 25.4 °C by the end of August.
Karuizawa experiences heavy rainfall in August, with over 20 rainy days and an average total precipitation 218.2 mm.
Is August a good time to visit Karuizawa? check out the best time to travel to Karuizawa page.
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Karuizawa Weather August
Temperatures trend during August in Karuizawa
August weather in Karuizawa day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Aug. |  Sunny | 30° /19° | 0.8 mm | 8 | |
| 2 Aug. |  Patchy rain possible | 31° /20° | 5.3 mm | 7 | |
| 3 Aug. | Patchy rain possible | 28° /17° | 0.2 mm | 6 | |
| 4 Aug. | Light rain shower | 29° /18° | 4 mm | 7 | |
| 5 Aug. | Light rain shower | 27° /17° | 6.3 mm | 6 | |
| 6 Aug. | Light rain shower | 27° /17° | 9.5 mm | 6 | |
| 7 Aug. |  Patchy light rain with thunder | 22° /16° | 20.6 mm | 5 | |
| 8 Aug. | Light rain shower | 24° /15° | 4.6 mm | 5 | |
| 9 Aug. | Light rain shower | 25° /15° | 4.5 mm | 6 | |
| 10 Aug. | Patchy rain possible | 24° /15° | 8.4 mm | 5 | |
| 11 Aug. | Patchy rain possible | 24° /16° | 4.3 mm | 6 | |
| 12 Aug. | Light rain shower | 24° /16° | 5.3 mm | 6 | |
| 13 Aug. | Light rain shower | 24° /17° | 11.1 mm | 6 | |
| 14 Aug. | Light rain shower | 23° /16° | 13.6 mm | 5 | |
| 15 Aug. | Light rain shower | 24° /16° | 9.8 mm | 6 | |
| 16 Aug. | Light rain shower | 23° /16° | 7.7 mm | 6 | |
| 17 Aug. |  Fog | 27° /16° | 1.6 mm | 6 | |
| 18 Aug. | Light rain shower | 26° /16° | 5 mm | 6 | |
| 19 Aug. | Patchy light rain with thunder | 28° /16° | 9.6 mm | 6 | |
| 20 Aug. | Patchy rain possible | 25° /16° | 5.2 mm | 6 | |
| 21 Aug. | Light rain shower | 25° /15° | 3.9 mm | 6 | |
| 22 Aug. | Light rain shower | 24° /16° | 4.5 mm | 5 | |
| 23 Aug. | Patchy light rain with thunder | 27° /16° | 3.9 mm | 6 | |
| 24 Aug. | Patchy light rain with thunder | 26° /17° | 16.5 mm | 6 | |
| 25 Aug. |  Moderate or heavy rain shower | 25° /16° | 18 mm | 6 | |
| 26 Aug. | Light rain shower | 27° /18° | 8 mm | 6 | |
| 27 Aug. | Light rain shower | 26° /17° | 4.7 mm | 6 | |
| 28 Aug. | Light rain shower | 25° /16° | 7.9 mm | 6 | |
| 29 Aug. | Light rain shower | 24° /14° | 7.2 mm | 6 | |
| 30 Aug. |  Moderate rain | 25° /17° | 8.4 mm | 6 | |
| 31 Aug. | Patchy rain possible | 26° /17° | 3.4 mm | 6 | |
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Karuizawa weather in August vs July vs September
| July | August | September | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 25°/16° | 25°/16° | 22°/14° |
| Rainfall | 198 mm | 218 mm | 149 mm |
| Wind | 8.7 km/h | 7.2 km/h | 8.2 km/h |
| Humidity | 82% | 84% | 86% |
| Rainy days | 27 days | 28 days | 25 days |
| Dry days | 4 days | 3 days | 5 days |
Planning a trip to Karuizawa? Discover the best time to visit
Karuizawa in August - FAQ
What are the expected maximum and minimum temperatures in Karuizawa during August?
How much rainfall should be expected in Karuizawa during August?
What are the typical wind conditions in Karuizawa during August?
August rainfall patterns in Karuizawa
UV exposure in Karuizawa during August
What to pack to Karuizawa in August?
Mild & changeable · highs around 25 °C, frequent showers
As you prepare for your trip to Karuizawa 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 Karuizawa, during August, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
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Where is Karuizawa?Get accurate weather forecasts for Karuizawa, located at latitude 36.35 and longitude 138.633. Stay updated with localized weather information tailored for Karuizawa.