UV Index in Union, United States

Last updated: August 1, 2025

Understanding the UV Index is essential for residents of Union, United States, as it serves as a crucial guide to sun safety and skin health. With typical UV exposure peaking between 11:00 AM and 1:00 PM, knowing the UV levels can help you take proactive steps to prevent sunburn and reduce the long-term risks of skin cancer. Given Union's Cfa climate, which can lead to intensified sun exposure, being aware of the UV Index is vital for protecting yourself and your loved ones. Stay informed to enjoy the sun safely!

Hourly UV Index in Union

As the sun rises, the UV Index starts off gently at 1 by 7:00 AM, gradually climbing as the day progresses. By 10:00 AM, it reaches 6, signaling a notable increase in solar radiation. The intensity peaks at 12:00 PM with a striking 10 and continues to soar to a maximum of 11 at 1:00 PM, marking the hour of greatest exposure. As the afternoon unfolds, the index begins to taper off—dropping to 10 at 2:00 PM and 8 by 3:00 PM. By late afternoon, the UV Index gracefully descends to 4 at 5:00 PM, settling back to 2 by 6:00 PM and finally returning to a gentle 1 by 7:00 PM. This highlights the importance of sun protection during mid-day when UV rays are at their most intense.

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
08:001low45 min
09:003moderate30 min
10:005moderate30 min
11:007high25 min
12:009very high15 min
13:0010very high15 min
14:009very high15 min
15:007high25 min
16:005moderate30 min
17:003moderate30 min
18:002low45 min
19:001low45 min

Monthly UV Index Trends in Union

Throughout the year, UV radiation levels fluctuate significantly, with high-risk months occurring between April and August where the UV Index reaches very high to extreme levels. Specifically, April (UV Index 9) and May (UV Index 10) present increased risks, with a burn time of just 15 minutes in May. The peak intensity is seen in June and July, where the UV Index hits 11, categorizing it as extreme; here, just 10 minutes of unprotected exposure can result in burns. As summer transitions into fall, the UV Index gradually decreases, indicating a safer exposure period, but caution is still necessary in September (UV Index 9) and October (UV Index 7). For both residents and visitors, it is advisable to take appropriate sun safety measures during the high-risk months, such as wearing protective clothing, using sunscreen, and seeking shade during peak hours to prevent skin damage.

Monthly Maximum UV Index for Union, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Union. It measures the strength of ultraviolet radiation from the sun and helps assess the risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109653
Data source: Statistical UV Index data for Union, 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 Union UV Index with Other United States Cities

The table above highlights how UV exposure in Union 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.
Union'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
Union3569101111109753
Los Angeles UVI46891011111010754
Houston UVI589111112121110975