UV Index in Santa Clara, United States

Last updated: July 2, 2025

Understanding the UV Index in Santa Clara is crucial for protecting your skin from harmful ultraviolet rays. With a climate characterized as semi-arid, residents often experience significant UV exposure, particularly during the peak midday hours. Knowing the UV levels can help you take proactive measures to prevent sunburn and maintain skin health, especially when the index reaches dangerous highs of 11 and 13 between noon and 1 PM. By staying informed about the UV Index, you can enjoy the abundant sunshine of Santa Clara while keeping your skin safe and healthy.

Hourly UV Index in Santa Clara

The UV Index shows a dramatic rise in intensity throughout the morning, starting from a mild 1 at 07:00. By 09:00, the index reaches 4, indicating a moderate level of sun exposure risk. The peak UV radiation occurs at 13:00, soaring to a concerning 13, suggesting that sun protection is essential during this hour. As the afternoon progresses, the index gradually declines, dipping to 10 by 15:00 and falling to 1 by 19:00. For outdoor enthusiasts, it’s crucial to seek shade and apply sunscreen during peak hours between 11:00 and 14:00 to ensure safety under the sun.

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
09:004moderate30 min
10:006high25 min
11:009very high15 min
12:0011extreme10 min
13:0013extreme10 min
14:0012extreme10 min
15:0010very high15 min
16:007high25 min
17:004moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Santa Clara

Throughout the year, UV Index levels fluctuate significantly, with the highest risk months occurring from April to September when the index reaches its peak at 13 during June and July, classified as extreme exposure, necessitating careful sun protection strategies. In contrast, the lower risk months of January and December show a moderate UV Index of 5, allowing for longer burn times of 30 minutes. Visitors and residents are strongly advised to be vigilant and limit their sun exposure during the high-risk months of February through September, particularly during the peak hours between 10 AM and 4 PM, applying sunscreen, wearing protective clothing, and seeking shade whenever possible.

Monthly Maximum UV Index for Santa Clara, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Santa Clara. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec5810121213131211965
Data source: Statistical UV Index data for Santa Clara, 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 Santa Clara UV Index with Other United States Cities

The table above highlights how UV exposure in Santa Clara compares to other major locations across United States. This comparison helps travelers and residents better understand regional sun intensity and plan outdoor activities with sun safety in mind.
Santa Clara's solar exposure compared to other cities in United States. Generated using Copernicus Atmosphere Monitoring Service information.
 JanFebMarAprMayJunJulAugSepOctNovDec
Chicago UVI34689101098642
Brooklyn UVI35681010998642
New York City UVI35681010998642
Los Angeles UVI46891011111010754
Houston UVI589111112121110975
Santa Clara5810121213131211965