Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Saiki, Japan, where the sun's rays can pose significant risks, particularly during the peak hours of midday. With a humid subtropical climate (Cfa) that offers plenty of sunshine, being mindful of UV levels is essential for sunburn prevention and overall skin health. Saiki experiences a notable rise in UV exposure, peaking at an intense 12 around noon, making it vital for locals to stay informed about these fluctuations. By tracking the UV Index, you can safeguard your skin and enjoy the beautiful Saiki outdoors without compromising your health.
As the sun rises, the UV Index begins its ascent, starting at a low 2 at 7:00 AM. By 9:00 AM, it ramps up to a moderate 6, signaling that sun protection is becoming essential. The peak of the day arrives at 12:00 PM when the index skyrockets to a striking 12, suggesting that precautions against UV exposure are crucial. The intensity then gradually decreases, tapering off to 10 by 2:00 PM and falling further to a mild 4 by 4:00 PM. As evening approaches, the UV Index drops to 1 by 6:00 PM, indicating a safer time to enjoy the outdoors without the same level of concern. Keep this UV journey in mind for a safe and sun-smart day!
| 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 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the seasons change, so do the UV Index levels, significantly influencing sun exposure risk throughout the year. High-risk months are from March to August, when the UV Index peaks at 11 to 12, indicating extreme exposure with a burn time as short as 10 minutes. Particularly critical are May and July, when the UV Index consistently reaches its maximum. Conversely, the winter months of January and December present a moderate risk with an Index of 4, allowing for a safer exposure time of 30 minutes. To ensure safety, visitors and residents are advised to take precautions during high UV Index months by wearing sunscreen, protective clothing, and seeking shade, especially during midday hours when UV exposure is 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 |
| 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 |
| Saiki | 4 | 6 | 9 | 10 | 11 | 11 | 12 | 12 | 10 | 7 | 6 | 4 |