Last updated: June 2, 2025
In Shimo-tsuma, Japan, being aware of the UV Index is essential for maintaining optimal skin health and preventing sunburn. With UV levels peaking at 10 during midday hours, understanding daily fluctuations in UV exposure is crucial for safeguarding against harmful effects of the sun. The Cfa climate of Shimo-tsuma brings hot, humid summers that can elevate UV risks, especially between 10:00 AM and 2:00 PM when levels are at their highest. By staying informed about the UV Index in Shimo-tsuma, residents can take proactive measures to protect their skin and enjoy the outdoors safely.
The UV Index rises sharply from the early morning, peaking at 10 between 11:00 and 12:00, signaling intense sun exposure. As the day unfolds, 08:00 sees a jump to 5, while 09:00 and 10:00 bring increasing values of 7 and 9, respectively. The afternoon hours witness a gentle decline, with the index easing to 9 at 13:00 before dropping to 7 at 14:00. By the time the evening arrives, the UV levels decrease significantly, resting at 5 by 15:00, further declining to just 1 by 17:00, and tapering off to 0 after 19:00. To ensure safety during peak hours, it’s advisable to seek shade and wear protective clothing, especially between 11:00 and 12:00 when the sun is most potent.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 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 | 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 seasonal changes in UV Index reveal significant variations throughout the year, with the highest levels occurring in the summer months. March marks the transition into the high-risk category with a UV Index of 7, and by April and May, it escalates to 9 and 10 respectively, indicating very high levels of UV radiation. July reaches its peak at an extreme level of 11, posing the highest risk for skin damage with a burn time of only 10 minutes. Post-summer in August and September, UV levels remain notably high, while October drops to a high level of 6, still warranting caution. January, February, November, and December exhibit moderate UV levels, with burn times allowing for more extended exposure without burns. For both visitors and residents, it is vital to take protective measures during the high-risk months of March to September, including wearing sunscreen, protective clothing, and seeking shade during peak hours to minimize 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 |
| Shimo-tsuma | 3 | 5 | 7 | 9 | 10 | 10 | 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 |