Last updated: July 2, 2025
Understanding the UV Index in Mikasa, Japan is crucial for safeguarding your skin from harmful ultraviolet rays. With UV levels peaking at a striking 9 during midday, awareness of these fluctuations can help you prevent sunburn and protect skin health. Located in a Dfb climate zone, Mikasa experiences a range of sunlight exposure, making it essential to stay informed about UV risks throughout the day. By keeping track of the UV Index, you can enjoy the outdoors safely while minimizing potential damage to your skin.
As the sun rises, the UV Index begins its ascent, reaching a modest 3 by 7:00 AM. However, as the morning matures, it quickly climbs to 5 at 8:00 AM and reaches a peak of 9 from 11:00 AM to 12:00 PM, indicating a high level of UV exposure. By 1:00 PM, the index starts to decline slightly to 8, and continues its descent until it falls to 5 by 3:00 PM. The afternoon sun starts to wane with values dropping to 3 by 4:00 PM, and by 6:00 PM, we're left with a minimal 1 for the rest of the evening. It's a vital reminder to protect your skin during those peak hours when the UV Index is at its highest!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 5 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 5 | moderate | 30 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index experiences notable seasonal changes, indicating varying levels of sun exposure risk. The high-risk months typically occur from May to August, when the UV Index reaches very high levels (9-10), warranting caution as the burn time decreases to just 15 minutes. In contrast, the winter months of December and January present a much lower risk, with UV indexes of 2 and burn times extending to 45 minutes. Visitors and residents are advised to take appropriate precautions during the high-risk months, such as wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak sun hours to minimize potential skin damage. For the moderate months of February, April, October, and November, it’s important to remain aware of UV exposure and adjust outdoor activities accordingly.
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 |
| Mikasa | 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 |