Last updated: July 2, 2025
In Sagara, Japan, staying informed about the UV Index is essential for maintaining skin health and preventing sunburn. Understanding UV levels helps you take proactive measures to protect yourself against harmful UV radiation, especially during the peak hours when indexes reach as high as 12 at noon. With Sagara's Cfa climate, characterized by warm summers and moderate seasons, awareness of UV exposure risks becomes crucial for residents and visitors alike. As you enjoy the region's beautiful outdoor scenery, keeping an eye on the UV Index ensures you can safely bask in the sun while safeguarding your skin's health.
The UV Index throughout the day offers a clear insight into the sun's intensity. Starting at a modest 2 at 7:00 AM, the index steadily rises, reaching 4 by 8:00 AM. Things heat up as we approach 10:00 AM, with the UV Index peaking at an impressive 12, indicating a high risk of harm from unprotected sun exposure. The midday sun is relentless, remaining at 12 until 1:00 PM. After that, a gradual decline begins, dropping to 10 at 1:00 PM and falling to 6 by 3:00 PM. As the sun starts to set, the UV Index drops significantly, dipping to 1 by 5:00 PM and eventually hitting 0 at 7:00 PM. For outdoor enthusiasts, it's crucial to take precautions during the peak hours for a safe and enjoyable day in the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 10 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 6 | high | 25 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index experiences significant seasonal variation, with March through September being the high-risk months for sun exposure. March begins the rise with an index of 8 (very high) and only a 15-minute burn time, peaking in July with an index of 12 (extreme) and a mere 10-minute burn time. May through August consistently holds an extreme exposure category, urging increased caution during these months. As summer transitions into fall, the index gradually decreases, with October dropping to 7 (high) and 15-minute burn times for October and September, before returning to moderate levels in winter. Visitors and residents are advised to take precautions during the high-risk months by seeking shade, wearing protective clothing, and applying sunscreen regularly to minimize the risk of skin damage.
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 |
| Sagara | 4 | 5 | 8 | 10 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 4 |
| Osaka UVI | 4 | 6 | 8 | 11 | 11 | 11 | 12 | 11 | 10 | 7 | 5 | 3 |