Last updated: July 2, 2025
Understanding the UV Index in Hagi, Japan is crucial for protecting your skin and preventing sunburn during the warmer months. With the area's typical Cfa climate, residents and visitors face heightened UV exposure, especially between late morning and early afternoon. On sunny days, the UV Index can peak at 12, indicating a very high risk of harm from unprotected sun exposure. Staying informed about these levels allows you to take necessary precautions, ensuring your skin remains healthy while you enjoy the beautiful outdoor scenery that Hagi has to offer.
The UV Index throughout the day showcases a dynamic shift in sun intensity, peaking at 12 around noon. Beginning with a gentle 2 at 7:00 AM, the index steadily increases, hitting 11 by 11:00 AM as the sun climbs higher. By 12:00 PM, the sun reaches its zenith at 12, marking the highest UV exposure, making sun safety a priority. As the afternoon progresses, from 1:00 PM to 3:00 PM, the UV Index gradually decreases to 9 by 2:00 PM and 7 by 3:00 PM. The day winds down with a notable drop in intensity, returning to a mild 1 by 6:00 PM, emphasizing that the safest time to enjoy the sun is before noon or after 4:00 PM.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | 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 | 12 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 4 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the year progresses, the UV Index reveals significant seasonal changes and highlights high-risk months for sun exposure. From January to February, the UV Index remains in the moderate range (4-5), with a burn time of 30 minutes. However, starting in March, the UV Index surges to 8, classified as very high, drastically reducing safe exposure time to just 15 minutes. The peak risk occurs between April and August, with the UV Index reaching up to 12 (extreme), necessitating protective measures after just 10 minutes of sun exposure. As summer transitions to fall, the UV Index begins to decline, with September still presenting a very high level (10), before settling into high levels in October and November (6-7) with safer burn times of 25 minutes. December marks the lowest UV levels at 3, re-entering the moderate range. Visitors and residents are advised to exercise caution during the high-risk months of April to August, employing sunscreen, seeking shade, and wearing protective clothing to minimize the risks associated with intense 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 |
| 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 |
| Hagi | 4 | 5 | 8 | 11 | 11 | 11 | 12 | 12 | 10 | 7 | 6 | 3 |