UV Index in Chester, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Chester, United States, where the Csb climate can lead to varying levels of sun exposure throughout the year. Awareness of UV levels helps you safeguard against sunburn and long-term skin health issues, making it essential to monitor these daily readings. During peak sun hours, especially around midday when the UV Index can soar to a staggering 11, the risk of harmful skin damage increases significantly. Being informed about the UV Index empowers you to take proactive measures, ensuring your outdoor activities remain safe and enjoyable under Chester’s vibrant skies.

Hourly UV Index in Chester

The UV Index today paints a vivid picture of solar intensity, peaking dramatically between 12:00 PM and 2:00 PM with a striking 11—a warning to seek shade and protect skin. Starting the day at a gentle 1 at 7:00 AM, the index gradually climbs, reaching 4 by 9:00 AM and escalating to 9 by 11:00 AM. As the sun reaches its zenith, the index hits 11, indicating extreme conditions that persist for a solid three hours. Following this midday blast, it gracefully declines to 6 by 4:00 PM, before tapering off to a safer 1 by the evening. Remember to stay sun-smart during those peak hours!

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	6	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	11	extreme	10 min
14:00	11	extreme	10 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

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