UV Index in Grafton, United States

Last updated: July 2, 2025

Understanding the UV Index in Grafton, United States, is crucial for protecting your skin and maintaining overall health. With UV levels peaking at an impressive 8 around noon, awareness of these readings can help prevent sunburn and long-term skin damage. Grafton's Dfb climate means it experiences varied seasonal conditions, but when the sun shines bright, the risk of harmful UV exposure can be significant. Stay informed on daily UV levels to enjoy the outdoors responsibly and keep your skin safe from the sun's rays!

Hourly UV Index in Grafton

At sunrise, the UV Index starts off low at 1 by 07:00 and 08:00, making it a safe time for morning activities. However, as the sun climbs, the intensity ramps up quickly. By 09:00, it rises to 3, and from 10:00 onwards, you’ll want to take precautions as it reaches a peak of 8 between 12:00 and 15:00. This period is critical; ensure you're well-protected! Later in the day, the index gradually dips back down to 6 at 16:00, before falling further to 4 by 17:00. As evening approaches, it cools down to 2 at 18:00 and returns to 1 by 19:00, making it safe again to enjoy the outdoors. Stay informed and safe as the UV levels change throughout the day!

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	4	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	8	very high	15 min
14:00	8	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 Grafton

Throughout the year, the UV Index experiences notable fluctuations, indicating varying levels of sun exposure risk. The high-risk months typically span from April to August, with peaks in May and June, where the UV Index reaches 8 and 9, presenting a very high exposure category and a burn time of just 15 minutes. As a result, it is crucial for both visitors and residents to take protective measures during these months, such as wearing sunscreen, protective clothing, and seeking shade during peak sunlight hours. Conversely, during the cooler months of January and December, the UV Index is at its lowest, registering 2 and allowing for longer burn times of up to 45 minutes. It is essential to remain vigilant and adjust sun safety practices accordingly as the seasons change.

Monthly Maximum UV Index for Grafton, United States

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

The table above highlights how UV exposure in Grafton 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.

Grafton'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
Grafton	2	4	5	7	8	9	8	8	7	4	3	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