UV Index in Jamestown, United States

Last updated: July 2, 2025

In Jamestown, United States, being aware of the UV Index is essential for maintaining skin health and preventing sunburn during peak sun exposure hours. Understanding UV levels helps residents and visitors protect themselves from harmful ultraviolet rays, particularly in this Dfb climate zone, where varying seasonal conditions can contribute to fluctuating UV risks. With UV Index values peaking at 10 during midday, it's crucial to take proactive sun safety measures to enjoy the outdoors while minimizing the risk of skin damage.

Hourly UV Index in Jamestown

The UV index begins its ascent at 07:00, starting at a gentle 1, then climbs gradually through the morning. By 10:00, it reaches a moderate 5, but from 11:00 onwards, the sun's intensity becomes pronounced, peaking at an impressive 10 between 13:00 and 14:00. After this zenith, the index dips to 8 at 15:00 and continues its decline, settling back to 2 by 18:00. As the day winds down into the evening, the UV index drops to a low 1 by 19:00, signaling a return to safer sun exposure levels. Enjoy the sunshine while staying protected during the high points!

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	3	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 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 Jamestown

The UV Index exhibits significant seasonal variation, peaking during the summer months. From March to September, the UV Index escalates from 6 (high) in March to a maximum of 10 (very high) in May through July, indicating a heightened risk of skin damage with a burn time as brief as 15 minutes. April and August also maintain very high levels, while October sees a decline to 6 (high) again. The high-risk months for UV exposure are therefore April through September, where vigilance is crucial. It is advisable for both visitors and residents to protect their skin by wearing sunscreen, protective clothing, and seeking shade during peak sun hours, particularly in these months. In contrast, December and January present lower UV risks, with the index at 2 and 3 respectively, allowing for more extended outdoor activities with less concern for UV-related harm.

Monthly Maximum UV Index for Jamestown, United States

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

The table above highlights how UV exposure in Jamestown 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.

Jamestown'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
Jamestown	3	4	6	9	10	10	10	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