Last updated: August 1, 2025
In Mutsu, Japan, being aware of the UV Index is crucial for protecting your skin and overall health as you enjoy the stunning landscapes and vibrant outdoor activities. Understanding UV levels helps you take proactive steps to prevent sunburn and other long-term skin damage, especially given the city's Dfb climate, which brings varying UV exposure risks throughout the year. With peak UV Index levels reaching up to 10 around midday, it's essential to stay informed and adopt sun safety practices to ensure a healthy and enjoyable experience under the sun.
The UV Index throughout the day displayed a notable rise, peaking at 10 between 11:00 AM and 12:00 PM, indicating a high risk of harm from unprotected sun exposure. Early risers experienced a moderate index, starting at 3 at 7:00 AM, while the intensity escalated significantly to 8 by 10:00 AM. A gradual decline followed after noon, with the index falling back to 5 by 3:00 PM, and dropping further to 1 by 5:00 PM, signaling a gentle evening. As the day progressed into the night, the UV Index settled at 0 by 7:00 PM, wrapping up a day of fluctuating sun exposure risks. Always remember to protect your skin during the peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 4 | moderate | 30 min |
| 09:00 | 7 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 11 | extreme | 10 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 |
The UV Index varies significantly throughout the year, reflecting seasonal changes in sun exposure. High-risk months for UV radiation include late spring and summer, specifically from April to August, when levels reach very high to extreme ratings, making burn times as low as 10 to 15 minutes. Visitors and residents should be particularly vigilant during these months; protective measures, such as wearing sunscreen, hats, and sunglasses, are essential. January through March and October exhibit moderate to high UV levels, where burn times range from 25 to 30 minutes, while November and December present lower UV risks with longer burn times of 30 to 45 minutes. It’s advisable to monitor local UV forecasts and adjust outdoor activities accordingly to minimize 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 |
| Mutsu | 3 | 4 | 5 | 8 | 9 | 10 | 10 | 11 | 8 | 6 | 4 | 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 |