Last updated: May 3, 2025
Understanding the UV Index in Miyakojima, Japan, is essential for protecting your skin and maintaining overall health, especially in this tropical paradise where the sun shines brightly. The UV levels here can soar high, peaking at an intensity of 13 around noon, indicating a serious risk of sunburn without proper precautions. As a city in the Cfa climate zone, Miyakojima experiences warm temperatures year-round, resulting in elevated UV exposure that can lead to long-term skin damage if not addressed. By staying aware of the UV Index, you can effectively strategize your outdoor activities, safeguarding your skin while enjoying the stunning natural beauty that this island offers.
As the day unfolds, the UV Index reveals a dynamic pattern of sun exposure that peaks during midday. Starting at a gentle 1 at 07:00, the index gradually climbs, reaching a moderate 5 by 09:00. However, the real intensity kicks in around 10:00, skyrocketing to 8, and hitting its zenith at 12:00 with a striking 13. Be cautious! Direct sunlight can be harmful, as it dips slightly to 12 at 13:00 before gradually falling back down through 11 at 14:00 and 8 at 15:00. By late afternoon, the UV levels decrease to 5 by 16:00, and finally sink back to 1 by 18:00 and 19:00. It's a reminder of the sun's powerful rays—plan your outdoor activities accordingly!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index shows significant seasonal changes, peaking during the summer months. From January to December, the highest UV readings occur from March to September, reaching an extreme level of 13. Particularly, May through September are categorized as high-risk months, with minimal safe exposure times of just 10 minutes. In contrast, the UV Index decreases to 7 in both January and December, indicating a transition to high exposure but with a more manageable burn time of 25 minutes. Visitors and residents are strongly advised to take precautions during the high-risk months, including wearing protective clothing, applying sunscreen regularly, and limiting sun exposure, especially between 10 a.m. and 4 p.m. to reduce the risk of skin 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 |
| 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 |
| Miyakojima | 7 | 10 | 12 | 12 | 13 | 13 | 13 | 13 | 13 | 10 | 9 | 7 |