UV Index in Union, United States

Last updated: June 2, 2025

Understanding the UV Index is essential for residents of Union, United States, where the climate can significantly influence sun exposure risks. With UV levels peaking during midday hours—reaching a maximum of 10 between 12 PM and 1 PM—awareness of these fluctuations helps in effective sunburn prevention and maintaining skin health. As a predominantly Csb climate zone, Union experiences moderate to high UV exposure, making it crucial for locals to check daily UV readings and take necessary precautions to protect their skin from potential harm.

Hourly UV Index in Union

The UVI hourly data reveals a distinct pattern throughout the day, showcasing the intensity of ultraviolet radiation. Starting at a mild 1 at 07:00, the UV Index climbs steadily, peaking at a maximum of 10 around noon. This signifies a peak exposure period, making it crucial to take protective measures such as wearing sunscreen or seeking shade. After the zenith at 12:00 and 13:00, the index gradually declines, dropping to 3 by the evening. As the day draws to a close, the UV levels return to a gentle 1 by 19:00. Be mindful of these fluctuations to enjoy sunny days safely!

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	3	moderate	30 min
09:00	5	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	10	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 min
16:00	5	moderate	30 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