Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Omiya, Japan, where the combination of a Cfa climate and high UV exposure can lead to significant skin health risks. During the warmer months, Omiya often experiences high UV levels, peaking at an intense 11 around midday, making sunburn prevention essential. By staying informed about the daily UV Index, you can effectively protect yourself from harmful rays and maintain healthy skin. Whether you're enjoying outdoor activities or simply soaking up the sun, being aware of UV levels is key to safeguarding your well-being in this vibrant city.
Throughout the day, the UV Index experiences a dynamic shift, peaking at 11 around 11:00 AM, reaching its most critical level. Early risers can expect a moderate level of 3 at 07:00 AM, which quickly escalates to 5 by 08:00 AM and hits 7 by 09:00 AM. As the sun climbs higher, the intensity escalates, showcasing a significant jump to 9 at 10:00 AM before reaching its zenith. After noon, there is a gradual decline: the index dips to 10 at 12:00 PM, then falls back to 9 at 1:00 PM, and continues to decrease, landing at 5 by 3:00 PM. Later, the UV levels diminish to 1 by 5:00 PM, and finally drop to 0 by 7:00 PM. It’s essential for outdoor adventurers to stay protected during the peak hours!
| 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 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 9 | 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 | 0 | low | 45 min |
The UV Index exhibits notable seasonal changes throughout the year, with high-risk months primarily occurring from March to September. March marks the shift to a high category (UV Index 7), while April and May escalate to very high (UV Index 9-10), culminating in extreme exposure levels during June and July (UV Index 11). As summer transitions to fall, the UV levels gradually decline, dipping to moderate levels by November and December. Visitors and residents should take necessary precautions, especially during the peak months of June and July, where the burn time is drastically reduced to just 10 minutes. It is advisable to wear protective clothing, apply sunscreen frequently, and seek shade during these high-risk times to minimize skin damage and health risks.
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 |
| Omiya | 3 | 5 | 7 | 9 | 10 | 11 | 11 | 10 | 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 |