UV Index in Ketchum, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Ketchum, United States, where the sunny, mountain climate can lead to significant UV exposure. With UV levels often peaking at 12 around midday, it's vital to recognize the importance of monitoring these levels to prevent sunburn and maintain skin health. Awareness of the UV Index not only helps you enjoy outdoor activities safely but also protects against long-term skin damage. Whether you're hitting the slopes or exploring summer trails, staying informed about Ketchum's typical UV risks is your first step toward a safer, healthier experience outdoors.

Hourly UV Index in Ketchum

As the sun rises, the UV Index begins its gradual ascent, starting at a gentle 1 at 7:00 AM. By 9:00 AM, it picks up the pace, reaching 3, but the real heat kicks in at 10:00 AM, where it soars to 6. The peak occurs between 12:00 PM and 2:00 PM, hitting a high of 12, signaling the need for sunscreen and protective gear if you’re venturing outdoors. In the afternoon, the index starts to decline, dropping to 10 at 3:00 PM, and gradually settling back to a lower 2 by 7:00 PM. Be mindful of the midday sun, as it brings the highest UV exposure, while the morning and evening hours offer a much gentler UV environment. Stay safe and enjoy your day in the 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	2	low	45 min
09:00	3	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	12	extreme	10 min
14:00	12	extreme	10 min
15:00	10	very high	15 min
16:00	8	very high	15 min
17:00	6	high	25 min
18:00	3	moderate	30 min
19:00	2	low	45 min

Monthly UV Index Trends in Ketchum

Throughout the year, UV levels fluctuate significantly, with March through September marked as high-risk months. During this period, the UV Index peaks, reaching an extreme level of 11 or higher in May, June, and July, where even brief exposure can lead to burns in just 10 minutes. The earlier spring months of March and April present a very high risk as well, requiring caution with a burn time of only 15 minutes. Conversely, the winter months of January, February, November, and December feature a moderate UV Index (3-5) with safer burn times of 30 minutes or more. To ensure safety, visitors and residents are advised to wear sunscreen, protective clothing, and seek shade during peak UV hours, especially from late spring to late summer.

Monthly Maximum UV Index for Ketchum, United States

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

The table above highlights how UV exposure in Ketchum 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.

Ketchum'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
Ketchum	3	5	8	9	11	12	11	10	9	6	4	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