UV Index in Chelsea, United States

Last updated: May 3, 2025

Understanding the UV Index in Chelsea, United States is crucial for protecting your skin and overall health. As summer days bring enhanced sunshine, knowing the UV levels can help you prevent sunburn and long-term skin damage. In Chelsea’s temperate climate, where sun exposure can vary significantly throughout the day, awareness of peak UV times—such as around noon when the index soars to 10—is essential. By staying informed, you can enjoy the outdoors while safeguarding your skin from harmful ultraviolet rays.

Hourly UV Index in Chelsea

The UV Index data presents a compelling picture of sun intensity throughout the day. Starting off gentle in the early hours, the index rises steadily from a modest 1 at 07:00 to a noticeable 3 at 09:00. The sun peaks around 12:00, reaching a striking 9, and breaks further into its strongest phase with a maximum of 10 at both 13:00 and 14:00. This indicates a high risk of harm from unprotected sun exposure during these hours. As the day progresses, the index gradually declines, dipping to 6 by 16:00, and then further to a safer 1 by 19:00. It’s clear that during the mid-afternoon, protective measures, such as sunscreen and shade, are crucial for health and safety under the blazing sun.

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	8	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 Chelsea

During the year, UV Index levels exhibit notable seasonal changes, with the highest risk months occurring from April to August. April and May both feature a very high UV Index of 10, while June and July reach an extreme level of 11, necessitating vigilant sun protection. The burn time decreases significantly during these months, dropping to just 10 minutes in June and July. Conversely, UV levels are moderate in January, November, and December, allowing for longer burn times of 30 minutes. Residents and visitors are advised to take precautions, especially during high-risk months, by seeking shade, wearing protective clothing, and applying sunscreen regularly to minimize the risk of overexposure. Awareness of these UV changes is crucial for maintaining skin health throughout the year.

Monthly Maximum UV Index for Chelsea, United States

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

The table above highlights how UV exposure in Chelsea 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.

Chelsea'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
Chelsea	3	6	7	10	10	11	11	10	9	7	5	3
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