Last updated: May 3, 2025
In Yili, China, understanding the UV Index is crucial for protecting your skin health and preventing sunburn. With its Dfb climate characterized by warm summers and cold winters, Yili can experience significant UV exposure, particularly during the peak hours between 10 AM and 2 PM when the UV Index reaches levels 8 and 9—indicating a high risk of harm from unprotected sun exposure. Staying informed about daily UV levels empowers residents and visitors alike to take necessary precautions, ensuring outdoor activities remain enjoyable and safe while minimizing long-term skin damage.
As the sun rises, the UV Index begins its steady ascent. At 7:00 AM, it starts at a modest 1, signaling a low risk for sun exposure. By 8:00 AM, it climbs to 3, prompting early risers to take some precautions. However, from 9:00 AM onward, the intensity increases significantly, peaking at 12:00 PM with a striking 9—a reminder that peak hours warrant serious sunscreen application and protective measures. The index hovers at 9 until 1:00 PM, before gradually tapering off, falling to 6 by 3:00 PM and concluding the day at 1 by 7:00 PM. This hourly UVI data beautifully illustrates the sun's powerful midday effect, underscoring the importance of vigilance when enjoying the outdoors during peak sun hours.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 8 | very high | 15 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 6 | 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, seasonal UV changes significantly affect sun exposure safety. From January to February, the UV Index gradually increases from a low of 2 to a moderate 4, allowing for longer burn times of 45 minutes to 30 minutes, respectively. As spring progresses, March and April see the UV Index rise to high levels (6 and 7), shortening safe exposure time to 25 minutes. The summer months of May to August are particularly critical, with very high UV levels peaking at 10 in June and remaining above 8, requiring protective measures for just 15 minutes of sun exposure. In early September, the UV Index decreases to high levels again, providing a brief respite with longer burn time opportunities. As autumn settles in, the UV exposure becomes moderate in October and November, before returning to low in December, where burn times increase to 30 and 45 minutes. Visitors and residents are advised to take special precautions during the high-risk months of May, June, July, and August—including wearing sunscreen, protective clothing, and seeking shade to minimize potential skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Yili | 2 | 4 | 6 | 7 | 9 | 10 | 9 | 8 | 7 | 5 | 3 | 2 |
| Beijing UVI | 2 | 3 | 5 | 8 | 9 | 9 | 10 | 9 | 7 | 6 | 4 | 2 |
| Chengdu UVI | 5 | 6 | 8 | 10 | 12 | 11 | 11 | 10 | 11 | 8 | 6 | 4 |
| Shanghai UVI | 5 | 6 | 8 | 10 | 10 | 11 | 12 | 11 | 11 | 8 | 6 | 4 |
| Guangzhou UVI | 7 | 9 | 11 | 12 | 13 | 13 | 13 | 12 | 11 | 10 | 9 | 7 |
| Shenzhen UVI | 7 | 10 | 12 | 12 | 14 | 13 | 13 | 13 | 12 | 11 | 9 | 7 |