UV Index in Chester, United States

Last updated: June 2, 2025

Understanding the UV Index is vital for residents of Chester, United States, where the combination of a Csb climate and varying UV levels can significantly impact your skin health. As sun exposure increases, especially during midday hours when the UV Index peaks at an extreme level of 12, awareness becomes crucial for preventing sunburn and long-term skin damage. By staying informed about daily UV levels, you can better protect yourself and enjoy the beautiful Chester outdoors while keeping your skin safe from harmful rays.

Hourly UV Index in Chester

The UV Index throughout the day presents a fascinating pattern as the sun ascends. At 07:00, the index starts at a gentle 1, indicating minimal risk. However, by 09:00, it climbs to 4, marking the arrival of noticeable sunlight. The real intensity hits its peak at 12:00, soaring to an impressive 11—a cautionary moment for those outdoors. As we move through the afternoon, the index remains elevated, reaching 12 at 13:00 before gradually descending, settling back to 7 by 16:00. The evening sees a return to safer levels with 2 at 18:00 and finally back to 1 as the day wanes at 19:00. This dynamic shift underscores the importance of sun protection during peak hours, particularly from 10:00 to 14:00.

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	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	9	very high	15 min
16:00	7	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

As the seasons change, so do the UV levels, significantly impacting skin health. From January to February, the UV Index remains at a moderate level (4-5), allowing for approximately 30 minutes of safe exposure. However, come March through August, the UV Index escalates sharply, peaking at 12 in May and June, indicating extreme risk with a rapid burn time of just 10 minutes. September marks a decline to a very high UV level of 9, followed by lower indices in October (7), November (5), and December (3), where burn times increase back to 25-30 minutes. Visitors and residents should exercise caution during the high-risk months of March to August, opting for protective measures such as sunscreen, hats, and sunglasses to minimize UV exposure and prevent skin damage.

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	5	8	10	12	12	11	11	9	7	5	3
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5