Last updated: July 2, 2025
Understanding the UV Index in Soma, Japan is crucial for protecting your skin and overall health in this vibrant coastal city. Elevated UV levels, especially during the summer months, can lead to severe sunburns and long-term skin damage if precautions aren't taken. The climate in Soma, classified as Cfa, means warmer and humid summers with significant sun exposure, making it essential to monitor UV levels throughout the day. For instance, the UV Index peaks at an intense 11 around noon, indicating a high risk for harm without sun protection. Stay informed and safeguard your skin to enjoy the beautiful outdoors of Soma safely!
As the sun rises, the UV Index begins to climb, starting at a moderate 3 by 7:00 AM. By 8:00 AM, it's already reached 5, signaling the onset of a more intense UV exposure. The peak arrives around noon, where it skyrockets to an intense 11, highlighting the importance of sun protection during these hours. After this zenith, the index gradually declines, dipping to 9 by 1:00 PM and returning to a more manageable 5 by 3:00 PM. As the afternoon progresses, the UV intensity fades significantly, settling at 3 by 4:00 PM and dwindling further to 1 by 5:00 PM. Lastly, by the time dusk arrives at 7:00 PM, the UV Index drops to 0, wrapping up the day’s sun exposure. Stay vigilant and 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 | 11 | extreme | 10 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 |
Throughout the year, UV Index values experience significant seasonal changes, indicating varying levels of sun exposure risk. January and December have moderate UV Indexes (3), suggesting a safer exposure time of 30 minutes. As we move into February and November, the UV Index rises to 5, still moderate, but caution is warranted with a similar burn time. From March to October, the UV Index escalates, reaching its peak between July and August at an extreme level of 11, where only a mere 10 minutes of exposure can lead to burns. April and May also present very high risk with indexes of 9 and 10, respectively, offering 15 minutes of allowed exposure. The fall months, including September with a UV Index of 9, still require vigilance. Visitors and residents are urged to take necessary precautions during high-risk months—especially from March through August—to protect their skin, such as seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen regularly.
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 |
| Soma | 3 | 5 | 7 | 9 | 10 | 10 | 11 | 11 | 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 |