UV Index in Union, United States

Last updated: May 3, 2025

In Union, United States, being aware of the UV Index is crucial for maintaining healthy skin and preventing sunburn. Understanding UV levels is essential, especially in a Cfa climate like Union's, where the sun can be exceptionally strong during peak hours. With UV indices soaring to 11 around midday, residents and visitors alike must take proactive measures to protect themselves from harmful rays. By staying informed about daily UV fluctuations, you can enjoy the outdoors while safeguarding your skin’s health!

Hourly UV Index in Union

The UV Index undergoes a dramatic rise throughout the day, starting from a gentle 1 at 07:00 and gradually climbing to a peak of 11 by 13:00. As the sun reaches its zenith, UV exposure intensifies, with values soaring to 9 at noon and tapering off through the afternoon. By 15:00, the index begins to decline, slipping back to 6 by 16:00, and down to a safe 1 by 19:00. This data highlights the importance of sun protection during peak hours, especially between 10:00 and 15:00, when the UV Index is at its most potent.

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	1	low	45 min
09:00	3	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	6	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 Union

As the year progresses, UV radiation levels vary significantly, with the most intense exposure typically occurring from March through August. During this period, the UV Index reaches its peak levels, particularly in May, June, and July, where it is marked as extreme (Index of 11) and the burn time is as short as 10 minutes. Visitors and residents should take extra precautions during these high-risk months to protect their skin, including wearing protective clothing, using broad-spectrum sunscreen, and seeking shade during peak sunlight hours. As the year transitions into the fall months, UV levels decrease, dropping to moderate by December, providing some relief from the risks associated with UV exposure.

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.

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.
	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
Union	4	6	8	10	11	11	11	10	9	8	6	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5