Last updated: July 2, 2025
In Nemuro, Japan, being aware of the UV Index is crucial for maintaining skin health and preventing sunburn. With its Dfb climate characterized by distinct seasonal changes, exposure to ultraviolet rays can vary significantly throughout the year. Understanding daily UV levels, which can peak as high as 10 around noon, helps residents and visitors alike take proactive measures against harmful effects of the sun. Whether you're enjoying outdoor activities or simply taking a stroll, being informed about the UV Index can protect your skin and ensure a more enjoyable experience in this beautiful coastal city.
The UV Index climbs steadily throughout the morning, peaking at a maximum of 10 at 11:00 AM. Early risers will notice a moderate 3 at 07:00, but by 08:00, it escalates to a higher 5. The sun takes center stage by 09:00, reaching 7, and by the time it's 10:00, it soars to a 9. As the clock strikes 11:00 AM, sun worshippers should take heed as the index hits its highest point. After lunchtime, the UV Index begins to descend gracefully, dropping to 8 at 1:00 PM and further declining to 6 at 2:00 PM. By late afternoon, it falls to 4 at 3:00 PM, quickly diminishing to a mere 1 by 5:00 PM, before concluding with a safe 0 at 7:00 PM. Always remember to protect your skin during those 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 | 10 | 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 exhibits noticeable seasonal variations, ranging from a low of 2 in January to a peak of 10 in July. The highest-risk months for UV exposure are from April to September, with values consistently classified as high to very high during this period, indicating a burn time of just 15 minutes for unprotected skin. Visitors and residents are advised to take precautionary measures during these months, such as wearing protective clothing, applying sunscreen frequently, and seeking shade, especially during midday hours. As the UV Index decreases sharply in the fall and winter months, the danger of overexposure diminishes significantly, prompting less urgent protective measures from October to February.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nemuro | 2 | 3 | 5 | 7 | 9 | 9 | 10 | 9 | 8 | 5 | 3 | 2 |
| 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 |