Last updated: May 3, 2025
Understanding the UV Index is crucial in Iwaizumi, Japan, where the summer sun can pose significant risks to skin health. With UV levels peaking at 9 around noon, awareness of these levels is essential for preventing sunburn and long-term skin damage. Iwaizumi's Dfb climate brings varied weather, but the potential for high UV exposure remains a constant concern, especially during peak hours. By staying informed about the UV Index, you can protect yourself and enjoy the outdoors safely.
As the day begins, the UV Index starts at a moderate 3 at 7:00 AM, gradually rising to 4 by 8:00 AM. The intensity peaks sharply at 11:00 AM and 12:00 PM, reaching an impressive 9, highlighting the importance of sun protection during these hours. Following this peak, the index declines gradually, dropping to 6 by 2:00 PM and continuing its descent to 4 by 3:00 PM. By late afternoon, the UV exposure significantly diminishes, with values falling to 2 at 4:00 PM, to 1 by 5:00 PM, and finally resting at a safe 0 by 7:00 PM. Overall, the data underscores a clear trend: the midday hours demand vigilant sun safety practices.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 8 | very high | 15 min |
| 14:00 | 6 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index experiences significant fluctuations, peaking during the summer months. January and December show a moderate UV Index of 3, allowing for 30 minutes of sun exposure without risk of burning. As the seasons progress into February and March, the UV Index rises to 4 and 6 respectively, marking the start of the high-risk months. The situation escalates in April and May, where the UV Index reaches 9, categorized as very high, significantly reducing safe exposure time to just 15 minutes. The intensity peaks in June and August with an extreme UV Index of 11, necessitating caution, as even 10 minutes of sun can lead to burns. July and September follow closely with a very high index of 10 and 9 respectively. As autumn approaches, the UV levels drop again to 6 in October, and gradually return to moderate levels in November and December. Visitors and residents are advised to take precautions, especially during the high and extreme months, by using sunscreen, wearing protective clothing, and seeking shade during peak sun hours to safeguard against harmful UV exposure.
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 |
| Iwaizumi | 3 | 4 | 6 | 9 | 9 | 11 | 10 | 11 | 9 | 6 | 4 | 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 |