UV Index in Altdorf, Switzerland

Last updated: May 3, 2025

Understanding the UV Index in Altdorf, Switzerland is crucial for maintaining skin health and preventing sunburn, especially during the sunnier months. Knowledge of UV levels helps residents and visitors alike make informed choices about sun protection while enjoying Altdorf’s stunning outdoor landscapes. With its ET climate classification, Altdorf can experience varied UV exposure throughout the day, peaking at levels that can lead to skin damage in just a short period. From 8 AM onward, the UV Index rises steadily, reaching a maximum of 8 around 1 PM, emphasizing the importance of vigilance and precaution for everyone soaking in the alpine sun.

Hourly UV Index in Altdorf

The UV Index throughout the day reveals a stark rise in solar intensity as the sun reaches its peak. Starting at a mild 1 at 07:00, it gradually climbs to a noteworthy 8 by 13:00, signaling the need for sun protection during these hours. The intensity remains high at 8 until 14:00, after which it begins to taper off, dropping to 5 by 16:00 and falling further to 1 by 19:00. This data underscores the importance of safeguarding your skin, especially during the midday hours when the UV levels are most hazardous. Remember to protect yourself from the sun's rays when the UV Index is at its highest!

Average solar exposure data for the current time of the year. Actual values may vary and depend on many factors, such as cloud cover, vegetation cover, surface type, etc.
TimeUVICategoryTime to Burn
07:001low45 min
08:002low45 min
09:003moderate30 min
10:004moderate30 min
11:006high25 min
12:007high25 min
13:008very high15 min
14:008very high15 min
15:007high25 min
16:005moderate30 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Altdorf

Throughout the year, the UV Index displays significant seasonal changes, influencing sun safety for visitors and residents. The high-risk months span from April to August, with May peaking at a UV Index of 8 and June reaching a maximum of 10, both categorized as very high, indicating a burn time of just 15 minutes. In contrast, January and December present lower risks with a UV Index of 2, where exposure is considered low and the burn time extends up to 45 minutes. To ensure safety, it is advised that during the high-risk months, individuals should seek shade, wear protective clothing, and use sunscreen to mitigate the harmful effects of increased UV radiation.

Monthly Maximum UV Index for Altdorf, Switzerland

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Altdorf. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec2357810986422
Data source: Statistical UV Index data for Altdorf, based on information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

Compare Altdorf UV Index with Other Switzerland Cities

The table above highlights how UV exposure in Altdorf compares to other major locations across Switzerland. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Altdorf's solar exposure compared to other cities in Switzerland. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Basel UVI235689986421
Bern UVI235689986422
Zurich UVI235689986432
Altdorf2357810986432
Geneve UVI2367810987532
Lausanne UVI2467810997532