Last updated: June 2, 2025
Understanding the UV Index is crucial for residents and visitors in Tatsugo, Japan, where the Cfa climate brings warm summers and varied sunlight exposure. Being aware of UV levels not only helps in preventing sunburn but also plays a vital role in protecting skin health over the long term. With the UV Index peaking at an intense 13 around noon, it’s essential to take precautions during peak hours, especially given the region’s typical risks of high UV radiation exposure. Stay informed and safeguard your skin while enjoying the beautiful outdoors in Tatsugo!
Today’s UV index paints a clear picture of the sun's intensity throughout the day, starting mildly at 1 at 7 AM. As the morning progresses, the index rises steadily, reaching 3 by 8 AM and 6 by 9 AM. The sun reaches its peak heat around 12 PM, where the UV index hits a maximum of 13—a strong reminder to take precautions. As the afternoon unfolds, the levels gradually drop, with 10 at 2 PM and decreasing to 5 by 4 PM. By the evening, the index falls back to a tranquil 1 by 7 PM, signaling a return to a safer sun exposure threshold. Remember to stay protected during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | 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 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 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, UV levels exhibit significant seasonal variations, with March to September being particularly dangerous. The highest risk months—April through August—see UV Index values reaching extreme levels (12-13), where the recommended maximum exposure time is only 10 minutes. In contrast, January and December feature high UV Index values (6) with a burn time of 25 minutes, while February and October transition to very high levels (8-9) with shorter burn times. For both visitors and residents, it is crucial to take precautionary measures during high UV index months: use broad-spectrum sunscreen, wear protective clothing, and seek shade during peak sun hours. Always monitor the UV Index to ensure safe sun 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 |
| 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 |
| Tatsugo | 6 | 8 | 11 | 12 | 12 | 13 | 13 | 13 | 12 | 9 | 8 | 6 |