UV Index in Santa Clara, United States

Last updated: May 3, 2025

Understanding the UV Index is essential for residents and visitors in Santa Clara, United States, where the BSk climate can lead to significant sun exposure. As UV levels peak throughout the day, particularly during the midday hours with a maximum index of 12, awareness of these levels is crucial for preventing sunburns and promoting skin health. By keeping an eye on the UV Index, you can engage in outdoor activities safely while protecting your skin from harmful rays that can cause long-lasting damage. In this sun-soaked region, being informed helps you enjoy the beautiful Californian outdoors without compromising your well-being.

Hourly UV Index in Santa Clara

The UV Index today presents a clear picture of sun intensity throughout the day. Starting off at a gentle 1 at 07:00, it gradually escalates to a moderate 4 by 09:00. The real intensity kicks in around 10:00, peaking at 12 from 12:00 to 14:00—making it crucial to take sun safety precautions during this window. As the afternoon progresses, the index begins to decline, dropping to 10 by 15:00 and then retreating back to 4 by 17:00. The evening sees a gentle fade to a light 2 at 18:00, finally settling back at a low 1 by 19:00. Enjoy the sun but remember, protection is key when the UV Index peaks!

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.
Time	UVI	Category	Time to Burn
07:00	1	low	45 min
08:00	2	low	45 min
09:00	4	moderate	30 min
10:00	7	high	25 min
11:00	9	very high	15 min
12:00	12	extreme	10 min
13:00	12	extreme	10 min
14:00	12	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 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.

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.
	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Chicago UVI	3	4	6	8	9	10	10	9	8	6	4	2
Brooklyn UVI	3	5	6	8	10	10	9	9	8	6	4	2
New York City UVI	3	5	6	8	10	10	9	9	8	6	4	2
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5
Santa Clara	5	8	10	12	12	13	13	12	11	9	6	5