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UV Index in Xi’an Today
October 17, 2026 · Xi’an, China
6,501,190 people
See today's UV index in Xi’an hour by hour below. The UV index shows how strong the sun's ultraviolet radiation is — the higher the number, the faster skin can burn. Values are calculated for Xi’an's coordinates and updated daily.
UV has dropped for today
Hour by hour
Clouds cut the peak by ~40%Clear sky
Remember today
- Sunscreen SPF 30+
- Sunglasses
Daylight: sunrise 06:51 – sunset 18:09
Tomorrow: UV 6 at its peak around 12:00
The UV index in Xi’an peaks at 3 (moderate) around 14:00 today. The index stays below 3 all day, so no particular sun protection is needed. Cloud cover is damping the peak by roughly 40% compared with a clear sky. Tomorrow the index is forecast to peak at 6 around 12:00.
UV index in Xi’an hour by hour
| Time | UV index | Level |
|---|---|---|
| 06:00 | 0 | Low |
| 07:00 | 0 | Low |
| 08:00 | 0.1 | Low |
| 09:00 | 0.4 | Low |
| 10:00 | 0.6 | Low |
| 11:00 | 1.9 | Low |
| 12:00 | 2 | Low |
| 13:00 | 2.5 | Low |
| 14:00 | 2.7 | Low |
| 15:00 | 2 | Low |
| 16:00 | 0.9 | Low |
| 17:00 | 0.3 | Low |
| 18:00 | 0 | Low |
| 19:00 | 0 | Low |
UV index in Xi’an
Xi’an lies at 34°N. The midday sun reaches 46.7° above the horizon in Xi’an today, against a yearly ceiling of 79.2°. Elevation is what sets the ceiling for UV, and over Xi’an it is high enough for the index to reach very high values through the summer months.
What is the UV index?
The UV index is an international scale describing the strength of the sun's ultraviolet radiation at ground level. It starts at 0 and is effectively open-ended — at mid-latitudes it rarely exceeds 8, while in the tropics and high in the mountains it can pass 11. The higher the number, the less time it takes to get sunburnt.
The UV index depends mainly on how high the sun is in the sky. That is why it peaks around solar noon and is greatest in summer near the longest day of the year. Clouds, ozone, altitude and reflection from snow or water also affect the value.
The WHO UV scale
| UV index | Level | Recommendation |
|---|---|---|
| 0–2 | Low | No special protection needed. |
| 3–5 | Moderate | Use sunscreen (SPF 30+), seek shade around midday. |
| 6–7 | High | Sunscreen, hat and sunglasses. Avoid the sun 12:00–15:00. |
| 8–10 | Very high | Extra protection. Limit midday sun exposure. |
| 11+ | Extreme | Avoid the sun at midday. Full protection required. |
See also sunrise, sunset and daylight hours in Xi’an.