Last updated: July 2, 2025
Understanding the UV Index is essential for residents and visitors of Tosashimizu, Japan, especially during the peak summer months when the sun’s rays can be particularly intense. This awareness not only aids in preventing sunburn but is also crucial for maintaining overall skin health. With a Cfa climate that brings warm summers, the risk of high UV exposure is ever-present, with indexes reaching a peak of 12 around midday. Being informed about daily UV levels empowers you to take appropriate precautions, ensuring you enjoy the beautiful outdoors while protecting your skin from potential harm.
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 |
Throughout the year, the UV Index experiences significant variations, peaking in the summer months. From May to August, the index reaches an extreme level of 12, indicating a burn time of only 10 minutes; therefore, it is crucial for visitors and residents to take extra precautions during this period, such as wearing sunscreen, sunglasses, and protective clothing. March and April also present high levels, with indexes of 9 and 10, respectively, making these months a time to be vigilant as well. Conversely, during the winter months of January and December, the index drops to levels categorized as moderate (UV Index 4), allowing for longer burn times of 30 minutes. Overall, the high-risk months to be particularly cautious are May through August, and to ensure safety, it’s advisable to seek shade and limit sun exposure during peak hours.
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 |
| Tosashimizu | 4 | 6 | 9 | 10 | 12 | 12 | 12 | 12 | 10 | 7 | 6 | 4 |