Last updated: August 1, 2025
Understanding the UV Index is crucial for residents and visitors of Sakai, Japan, where the climate often presents significant sun exposure risks. With levels peaking at 11 during midday hours, awareness can play a vital role in preventing sunburn and protecting skin health. As a city nestled in a Cfa climate zone, Sakai experiences warm summers that can elevate UV radiation, making it essential to monitor these levels to enjoy the sun safely. Stay informed and keep your skin healthy by checking the UV Index before heading outdoors!
As the day unfolds, the UV Index reaches its peak during midday, providing an insightful glimpse into the sun's intensity. Starting from a modest 2 at 7:00 AM, the index climbs steadily, hitting 4 by 8:00 AM. By 9:00 AM, it escalates dramatically to 7, before soaring to its maximum of 11 at both 11:00 AM and 12:00 PM. As the afternoon progresses, the UV levels begin to ease, decreasing to 10 at 1:00 PM, then drifting down to 7 by 2:00 PM, and further to 5 at 3:00 PM. The descent continues into the evening, with the index dropping to 3 at 4:00 PM and tapering off to 1 by 5:00 PM, before settling at 0 by 7:00 PM. This data serves as a reminder to stay sun-safe, particularly during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 7 | high | 25 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 shows significant seasonal variations, indicating changes in the potential for skin damage. From January to February, the UV Index is moderate (3-5) with a burn time of 30 minutes. As March approaches, the UV Index rises sharply to 8, marking the beginning of high-risk months, which continue through July when it peaks at 11 (extreme exposure). The highest risk persists until August with UV levels remaining very high. From September to October, the index gradually declines to 7 and 5, transitioning back to moderate levels by November and December. Visitors and residents should exercise caution during high-risk months (March to August), limiting sun exposure, and using protective measures like sunscreen and clothing to prevent skin damage. Regular monitoring of UV levels is advisable, especially in the peak summer months when the risks are greatest.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sapporo UVI | 2 | 3 | 6 | 7 | 9 | 9 | 9 | 10 | 8 | 5 | 3 | 2 |
| Sakai | 3 | 5 | 8 | 9 | 10 | 10 | 11 | 10 | 9 | 7 | 5 | 3 |
| 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 |