UV Index in Hartford, United States

Last updated: May 3, 2025

Understanding the UV Index in Hartford, United States, is crucial for protecting your skin and overall health. With the potential for sunburn and long-term skin damage, being aware of daily UV levels helps you make informed decisions about outdoor activities. Hartford's Cfa climate results in varying UV exposure throughout the day, peaking at high levels around midday. For instance, the UV Index can reach 10 between noon and 1 PM, emphasizing the need for protective measures during those hours. Stay informed and enjoy the sunshine safely!

Hourly UV Index in Hartford

The UV Index throughout the day showcases a dynamic pattern of sun exposure, peaking during the afternoon. At 07:00, the index starts low at 1, gradually increasing as the sun rises. By 10:00, it reaches 6, signaling a rise in sun intensity, culminating in a striking 10 from 12:00 to 13:00, indicating a high risk of harm from unprotected sun exposure. As the day progresses, the UV Index declines, dropping to 3 by 17:00, and steadily returning to 1 by 19:00. This data highlights the importance of sun protection, especially during midday when the UV Index is at its highest.

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	10	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	8	very high	15 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 Hartford

Throughout the year, UV levels fluctuate, with significant increases during the spring and summer months. January and December have moderate UV Index levels of 3, allowing for 30 minutes of unprotected sun exposure, while February sees a slight increase to 5. As spring arrives, March reaches a high UV Index of 6 with a 25-minute burn time, transitioning to very high levels of 9 in April and peaking at 11 in June—the highest risk month with only 10 minutes of safe exposure. July and August maintain a very high UV Index of 10 and 9, respectively, before gradually declining to 6 in October and returning to moderate levels in November. For visitors and residents, it is crucial to take extra precautions from April through September, particularly in June, by wearing protective clothing, using sunscreen, and seeking shade during peak hours to minimize the risk of harmful UV exposure.

Monthly Maximum UV Index for Hartford, United States

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

The table above highlights how UV exposure in Hartford 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.

Hartford'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
Hartford	3	5	6	9	10	11	10	9	9	6	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