Last updated: May 3, 2025
Understanding the UV Index in Nakagawa, Japan is crucial for protecting your skin and overall health, especially given the city’s Dfb climate, which brings a mix of notable sun exposure throughout the year. With peak UV levels reaching as high as 8 during midday, being aware of these readings is essential for preventing sunburn and reducing long-term skin damage. As you enjoy Nakagawa’s beautiful outdoors, taking the time to check the UV Index can make all the difference in ensuring safe sun exposure for you and your loved ones. Stay informed and keep your skin safe!
The UV Index analysis reveals a striking pattern throughout the day. Starting at 07:00 with a manageable level of 3, the intensity of ultraviolet radiation escalates, peaking at 11:00 and 12:00, where it reaches a high of 8. After this midday zenith, the UV Index begins to decline, dropping to 7 by 13:00 and gradually tapering off to 4 at both 14:00 and 15:00. By the late afternoon, it dwindles further to 2 at 16:00, before settling to a safe 1 by 17:00 and 18:00, ultimately reaching 0 by 19:00. This data underscores the importance of sun protection during the peak hours, especially between 10:00 and 14:00, when UV exposure can be most harmful.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 7 | high | 25 min |
| 14:00 | 5 | moderate | 30 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index experiences notable seasonal variations. January and December mark the lowest UV levels, categorized as low, with a burn time of 45 minutes. As spring approaches, both February and March see an increase to moderate levels, indicating a burn time of 30 minutes. The UV Index peaks in the summer months of May through August, reaching very high levels (UV Index 8-9) with a significantly reduced burn time of just 15 minutes. As autumn sets in, September returns to a high exposure category, allowing for a 25-minute burn time, while October and November shift back to moderate. Given these fluctuations, it’s crucial for visitors and residents to take precautions during the high-risk months of May through August, including seeking shade, wearing protective clothing, and applying sunscreen to prevent skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nakagawa | 2 | 3 | 5 | 7 | 8 | 9 | 9 | 9 | 7 | 5 | 3 | 2 |
| Sapporo UVI | 2 | 3 | 6 | 7 | 9 | 9 | 9 | 10 | 8 | 5 | 3 | 2 |
| Yokohama UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Tokyo UVI | 3 | 5 | 8 | 9 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 4 |
| Nagoya UVI | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 11 | 10 | 7 | 5 | 3 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |