UV Index in Chester, United States

Last updated: May 3, 2025

In Chester, United States, staying aware of the UV Index is crucial for protecting your skin and ensuring overall health. Understanding UV levels not only helps in preventing painful sunburns but also plays a vital role in reducing the long-term risk of skin damage and conditions such as skin cancer. With Chester's Cfa climate, characterized by warm summers and moderate humidity, residents face unique UV exposure risks, especially during peak hours when the index can soar to 10. By keeping an eye on the UV Index, you can enjoy the sunny days safely while safeguarding your skin's health.

Hourly UV Index in Chester

The UV Index starts off low at 1 during the early hours, peaking at 9 by noon and reaching its maximum of 10 between 1 PM and 2 PM. This signifies a critical period when sun protection is vital, as the intensity of UV rays can cause skin damage. As the afternoon progresses, the index gradually decreases, falling to 6 by 4 PM, then dropping to 2 by 6 PM and settling back to 1 as evening falls. If you’re planning outdoor activities, make sure to stay safe and shield yourself when the sun is at its strongest!

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	8	very high	15 min
12:00	9	very high	15 min
13:00	10	very high	15 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 Chester

Throughout the year, UV exposure fluctuates significantly, with the highest risk months typically being June, July, and August, where the UV Index peaks at 11, indicating extreme exposure levels with a burn time of just 10 minutes. From March to October, UV levels remain elevated, with March and April also categorized as very high, reaching an index of 8 to 10. Visitors and residents are strongly advised to take precautions during these months by wearing protective clothing, applying broad-spectrum sunscreen, and limiting sun exposure during peak hours. In contrast, the winter months, particularly January and December, present a lower risk with moderate UV levels of 3 to 4, allowing for more relaxed sun safety measures. However, it remains wise to stay informed and cautious year-round.

Monthly Maximum UV Index for Chester, United States

The monthly maximum UV Index (UVI) represents the highest UV radiation level recorded each month in Chester. 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 Chester, 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 Chester UV Index with Other United States Cities

The table above highlights how UV exposure in Chester 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.

Chester'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
Chester	4	6	8	10	10	11	11	10	9	8	6	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5