Last updated: August 1, 2025
In Siena, Italy, understanding the UV Index is crucial for protecting your skin from harmful ultraviolet rays. With peak UV levels often reaching 10 during the midday hours, residents and visitors alike should be aware of the potential for sunburn and long-term skin damage. The city's Cfa climate brings warm summers and moderate sun exposure, emphasizing the importance of monitoring UV levels daily. By staying informed about the UV Index, you can enjoy Siena's beautiful outdoors while prioritizing your skin health and preventive care.
As the sun rises, the UV Index gradually climbs, beginning at a mild 1 at 7:00 AM. By 9:00 AM, it reaches 3, prompting early risers to consider sun protection. The intensity peaks at 1:00 PM with a maximum of 10, signaling the most hazardous conditions for unprotected skin. As the afternoon unfolds, the index dips from 9 at 2:00 PM to 6 by 4:00 PM, offering a brief respite. As the day winds down, the UV rays decrease, falling to 2 by 6:00 PM and returning to a safe 1 by 7:00 PM. Stay mindful of these fluctuations to enjoy the sun while safeguarding your skin!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 4 | moderate | 30 min |
| 11:00 | 6 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index exhibits significant seasonal fluctuations, impacting the risk of UV exposure for visitors and residents. January and December generally feature a low UV Index of 2, allowing for safer outdoor activities, while February and March see a moderate rise to 4 and 5, respectively, with burn times of 30 minutes. Notably, the high-risk months kick off in April with an increased index of 7, reaching a peak during the summer months of May, June, and July, where the UV Index soars to 8-10, indicating very high levels of exposure and shortening burn times to just 15 minutes. This perilous UV exposure slightly recedes in August and September, but still remains significant with indices of 9 and 7. As temperatures cool, October and November return to moderate levels, while January and December revert to low exposure. Visitors and residents are advised to take extra precautions during high-risk months, especially from April to September, by using sunscreen, wearing protective clothing, and seeking shade, particularly during midday hours.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Milan UVI | 2 | 3 | 5 | 6 | 8 | 9 | 9 | 8 | 6 | 5 | 3 | 2 |
| Turin UVI | 2 | 3 | 6 | 7 | 8 | 10 | 9 | 9 | 7 | 5 | 3 | 2 |
| Siena | 2 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 7 | 5 | 3 | 2 |
| Rome UVI | 3 | 4 | 5 | 7 | 8 | 10 | 10 | 9 | 7 | 5 | 4 | 2 |
| Naples UVI | 3 | 4 | 6 | 7 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Palermo UVI | 3 | 5 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 7 | 4 | 3 |