Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors in Ozu, Japan, as it plays a vital role in protecting skin health and preventing sunburn. With peak UV levels often reaching as high as 11 during midday, it’s essential to be aware of sun exposure factors, particularly in this Cfa climate zone, where sunny days are frequent. By staying informed about UV levels, you can take necessary precautions to enjoy the outdoors safely while minimizing the risk of skin damage. Whether you're exploring the beautiful sights of Ozu or engaging in outdoor activities, keeping an eye on the UV Index can help you make informed decisions to safeguard your skin.
At sunrise, the UV Index begins its ascent, starting at a mild 2 at 07:00. As the sun climbs higher, it peaks dramatically at 11 between 11:00 and 13:00, indicating a high potential for skin damage without protection. The intensity wanes in the afternoon, dropping to 9 at 14:00 before gradually tapering off to 3 by 16:00. As evening approaches, the UV Index lowers to 1 by 18:00, signaling a safe time to enjoy outdoor activities without heavy sun protection. It's a clear reminder that while the midday sun brings its share of joy, caution is essential during peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, UV radiation levels dramatically fluctuate, impacting the risk of skin damage for both visitors and residents. The highest risk months occur from May to August, where the UV Index peaks at 11 to 12, indicating an extreme exposure category with a burn time of just 10 minutes. During these months, it is crucial to limit direct sun exposure and utilize protective measures such as sunscreen, hats, and clothing to safeguard skin health. March and April also present high levels of concern, categorized as very high with burn times of just 15 minutes. As seasons shift into fall and winter, the UV Index decreases, with December and January showing a moderate level, allowing for longer safe exposure times of 30 minutes. However, even during lower UV months, protective precautions are still advised. Stay informed and protect yourself year-round!
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 |
| 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 |
| Ozu | 4 | 6 | 8 | 10 | 11 | 11 | 12 | 12 | 10 | 7 | 6 | 4 |