UV Index in Union, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Union, United States, where the climate often features sunny days and higher UV exposure. Being aware of UV levels helps in preventing sunburn and protecting skin health, especially during peak hours when the index reaches its maximum of 11 around noon. With a Csb climate, Union experiences varying UV risks, making it essential to stay informed and take necessary precautions when enjoying the outdoors. By checking the UV Index regularly, you can safeguard your skin and enjoy all that the sunny days in Union have to offer!

Hourly UV Index in Union

As the sun rises, the UV Index begins its gradual ascent, starting at a gentle 1 at 07:00. By 08:00, it climbs to 2, signaling a mild increase in UV exposure. The intensity peaks dramatically at 12:00, where it reaches a striking 10, indicating a high risk for harm from unprotected sun exposure. 13:00 sees an even higher point of 11, making it crucial for sun safety measures. As the afternoon progresses, the index begins to descend—falling to 8 by 15:00 and tapering off to a more manageable 3 by 17:00. The day concludes with a soft decline, dropping back to 1 by 19:00. This hourly UVI data underscores the importance of protecting skin during the midday sun to prevent damage and ensure safety.

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	10	very high	15 min
13:00	11	extreme	10 min
14:00	10	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Union

Throughout the year, UV exposure fluctuates significantly, with the highest risk months occurring from March to August. During these months, the UV Index peaks in July at 11, categorized as extreme with a burn time of only 10 minutes. April and May also present very high levels with indices of 8 and 10, respectively, warning residents and visitors to exercise caution. As summer approaches, the burn time decreases, indicating that individuals should seek shade, wear protective clothing, and apply sunscreen frequently. Conversely, January and December see much lower UV indices of 3 and 2, allowing for safer outdoor activities with longer burn times of 30 to 45 minutes. It’s crucial for everyone to stay informed about UV levels and protect their skin, especially during the peak months of March through August.

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
Union	3	4	7	8	10	10	11	9	8	5	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