UV Index in Downey, United States

Last updated: June 2, 2025

Understanding the UV Index in Downey, United States is crucial for everyone looking to protect their skin health and prevent sunburn. With its Dfb climate, Downey experiences significant UV exposure, particularly from mid-morning to early afternoon when the index peaks at a staggering 11. Knowing these levels can help you take proactive steps to safeguard your skin against harmful UV radiation, ensuring you enjoy the California sun safely. Stay informed and keep your skin protected!

Hourly UV Index in Downey

As the sun rises and the day unfolds, the UV Index reveals a dramatic increase in solar intensity. At 07:00, it starts off mild with a UVI of 1, but by 08:00, it more than doubles to 2. The ascent continues, peaking at 12:00 with a striking UVI of 10, indicating a strong risk of harm from unprotected sun exposure. Peak hours arrive at 13:00 and 14:00, where it hits an impressive 11—the highest point of the day—before gradually tapering off. As the afternoon wanes, the index drops to 5 by 17:00 and back down to a safer 1 by 19:00. It's a perfect reminder to stay protected from those mid-day rays when UV levels are at their 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
10:006high25 min
11:008very high15 min
12:0010very high15 min
13:0011extreme10 min
14:0011extreme10 min
15:0010very high15 min
16:007high25 min
17:005moderate30 min
18:003moderate30 min
19:001low45 min

Monthly UV Index Trends in Downey

The UV Index exhibits significant seasonal variation, peaking during the summer months and dramatically declining in winter. From January to February, the UV Index ranges from 3 to 5, classified as moderate, allowing for around 30 minutes of safe sun exposure. However, March to June sees a sharp increase, reaching an extreme level of 11 in both June and July, where unprotected skin can burn in just 10 minutes. The high-risk months for UV exposure are therefore March through August, where the index remains predominantly high to extreme. As a result, it is crucial for visitors and residents to take protective measures during these months, such as wearing sunscreen, protective clothing, and seeking shade, especially during peak hours. From September to December, while the UV Index decreases, users should still remain vigilant, as moderate levels persist late in the year.

Monthly Maximum UV Index for Downey, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Downey. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109643
Data source: Statistical UV Index data for Downey, 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 Downey UV Index with Other United States Cities

The table above highlights how UV exposure in Downey 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.
Downey'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
Downey3589101111109643
Los Angeles UVI46891011111010754
Houston UVI589111112121110975