Last updated: August 1, 2025
Understanding the UV Index in Himi, Japan is crucial for safeguarding your skin and overall health. As the sun rises, so does the potential for harmful UV exposure, peaking with an index of 11 around noon—signifying a very high risk of harm from unprotected sun exposure. With Himi's Cfa climate, characterized by warm summers, residents and visitors alike should be aware of UV levels to prevent sunburn and long-term skin damage. By staying informed about daily UV readings, you can enjoy the beautiful outdoors while keeping your skin safe from the sun's intense rays.
As the sun rises, the UV Index begins its ascent, starting at a gentle 2 at 07:00. By 08:00, it climbs to 4, indicating that protective measures are beginning to be advisable. The intensity peaks at 11 during the 11:00 and 12:00 hours, marking the time when sunlight is most potent. As the afternoon progresses, the index starts to decline; by 14:00, it drops to 8, and further diminishes to 6 by 15:00. As evening approaches, the UV Index wanes significantly, reducing to 3 at 16:00 and sinking to a mild 1 by 18:00, indicating a much lower risk. Overall, it’s a sun-soaked day, urging outdoor enthusiasts to be mindful of sun exposure, especially 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 | 11 | extreme | 10 min |
| 13:00 | 10 | very high | 15 min |
| 14:00 | 8 | very high | 15 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 | 0 | low | 45 min |
As the seasons change, so do UV levels, with significant increases during the warmer months. From March to August, the UV Index rises dramatically, peaking at 11 (extreme) in June, July, and August, where burn times are as short as 10 minutes. April and May also present high risk, with a UV Index of 10 (very high) and burn times of 15 minutes. Conversely, the risk decreases significantly in the cooler months, with a moderate exposure category during January, February, November, and December, allowing for 30 minutes of safe sun exposure. Visitors and residents should take extra precautions from March to September, using sunscreen, wearing protective clothing, and seeking shade, especially during peak hours, to minimize sun 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 |
| Himi | 3 | 5 | 7 | 10 | 10 | 11 | 11 | 11 | 9 | 6 | 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 |