Weather in Karuizawa for September 2027
In general, the average temperature in Karuizawa at the beginning of September is 23 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 19.1 °C by the end of September.
Karuizawa experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 219.6 mm.
Is September a good time to visit Karuizawa? check out the best time to travel to Karuizawa page.
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Karuizawa Weather September
Temperatures trend during September in Karuizawa
September weather in Karuizawa day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 26° /18° | 0.9 mm | 5 | |
| 2 Sept. |  Light rain | 27° /17° | 3.6 mm | 5 | |
| 3 Sept. |  Moderate rain | 22° /17° | 12.9 mm | 4 | |
| 4 Sept. | Light rain | 20° /14° | 7 mm | 3 | |
| 5 Sept. | Moderate rain | 20° /14° | 20.2 mm | 3 | |
| 6 Sept. | Light rain | 21° /14° | 7.1 mm | 4 | |
| 7 Sept. |  Heavy rain | 25° /15° | 31.3 mm | 4 | |
| 8 Sept. | Moderate rain | 24° /17° | 16.4 mm | 4 | |
| 9 Sept. | Moderate rain | 23° /16° | 14.4 mm | 4 | |
| 10 Sept. | Light rain | 20° /15° | 6.4 mm | 4 | |
| 11 Sept. | Moderate rain | 20° /14° | 12 mm | 4 | |
| 12 Sept. | Light rain | 21° /15° | 6.1 mm | 3 | |
| 13 Sept. | Light rain | 23° /15° | 5.1 mm | 4 | |
| 14 Sept. | Light rain | 25° /16° | 5.9 mm | 5 | |
| 15 Sept. | Light rain | 23° /16° | 4.9 mm | 4 | |
| 16 Sept. | Moderate rain | 22° /16° | 12.9 mm | 4 | |
| 17 Sept. | Light rain | 25° /15° | 4 mm | 4 | |
| 18 Sept. | Light rain | 24° /15° | 4.5 mm | 5 | |
| 19 Sept. | Light rain shower | 20° /13° | 1.7 mm | 3 | |
| 20 Sept. | Light rain | 20° /14° | 5.2 mm | 4 | |
| 21 Sept. | Light rain | 20° /14° | 5.9 mm | 3 | |
| 22 Sept. | Light rain shower | 21° /11° | 2 mm | 5 | |
| 23 Sept. | Patchy rain possible | 18° /11° | 0.5 mm | 4 | |
| 24 Sept. |  Fog | 19° /11° | 0.2 mm | 3 | |
| 25 Sept. |  Partly cloudy | 21° /10° | 0 mm | 4 | |
| 26 Sept. | Light rain | 20° /13° | 7.8 mm | 4 | |
| 27 Sept. | Light rain shower | 20° /12° | 1.1 mm | 4 | |
| 28 Sept. | Light rain | 20° /12° | 9.8 mm | 3 | |
| 29 Sept. | Light rain | 17° /12° | 9.2 mm | 3 | |
| 30 Sept. | Fog | 17° /10° | 0.7 mm | 3 | |
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Karuizawa weather in September vs August vs October
| August | September | October | |
|---|---|---|---|
| Weather | Patchy rain possible | Patchy rain possible | Patchy rain possible |
| Temperatures | 25°/16° | 21°/14° | 16°/8° |
| Rainfall | 220 mm | 220 mm | 115 mm |
| Wind | 8.3 km/h | 8.6 km/h | 8.9 km/h |
| Humidity | 85% | 88% | 83% |
| Rainy days | 24 days | 21 days | 12 days |
| Dry days | 7 days | 9 days | 19 days |
Planning a trip to Karuizawa? Discover the best time to visit
Karuizawa in September - FAQ
What are the expected maximum and minimum temperatures in Karuizawa during September?
How much rainfall should be expected in Karuizawa during September?
What are the typical wind conditions in Karuizawa during September?
September rainfall patterns in Karuizawa
UV exposure in Karuizawa during September
What to pack to Karuizawa in September?
Mild · highs around 21 °C, frequent showers
As you prepare for your trip to Karuizawa in September, 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 September, is comfortable and enjoyable, regardless of the weather conditions.
🧥 Clothing
👟 Footwear
🎒 Accessories
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.