UV Index in Chatham, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Chatham, United States, where sunny days are frequent, and the potential for harmful UV exposure is high. Keeping track of UV levels not only helps in preventing sunburn but also plays a significant role in maintaining long-term skin health. With Chatham's Dfa climate, the UV Index can reach its peak during midday hours, often hitting levels of 8 to 9, indicating a serious risk of overexposure. Being aware of these levels empowers you to take necessary precautions, ensuring that you enjoy the sunshine safely while protecting your skin from damage.

Hourly UV Index in Chatham

The UV Index throughout the day presents a clear pattern of intensity, peaking at midday. Starting from a mild level of 1 at 07:00, the index rises steadily, reaching 2 by 08:00. The real surge occurs between 09:00 and 13:00, where it escalates from 4 to a striking 9—the highest point of the day. As the afternoon unfolds, the intensity slightly declines to 7 at 15:00, before tapering off to 5 at 16:00. The evening sees a further decrease, settling back to 2 by 18:00 and returning to 1 at 19:00. For those enjoying outdoor activities, it’s essential to take precautions, especially during the peak hours from 11:00 to 14:00 when the UV rays are most potent.

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	8	very high	15 min
12:00	9	very high	15 min
13:00	9	very high	15 min
14:00	9	very high	15 min
15:00	7	high	25 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 Chatham

As the seasons change, so do UV index levels, which indicate the intensity of ultraviolet radiation. High-risk months for UV exposure occur from April through September, with the most severe levels of UV radiation peaking in May and June, where the index reaches a dangerous 10. During these months, it is crucial for visitors and residents to limit sun exposure, seek shade, and use sunscreen, as the recommended burn time reduces to just 15 minutes in peak conditions. Conversely, during the winter months of January and December, the UV index is considerably lower, ranging from 2 to 3, where longer exposure is permissible. Visitors and residents should remain vigilant during the higher UV months and proactively protect their skin to reduce the risks of UV-related health issues.

Monthly Maximum UV Index for Chatham, United States

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

The table above highlights how UV exposure in Chatham 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.

Chatham'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
Chatham	3	5	6	8	10	10	9	9	7	6	4	2
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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5