UV Index in Sisters, United States

Last updated: May 3, 2025

Understanding the UV Index in Sisters, United States is essential for protecting your skin while enjoying the beautiful outdoors. With the area’s unique Csb climate, residents and visitors alike can be exposed to significant UV radiation, especially during midday hours when levels peak. Being aware of these UV levels is crucial for preventing sunburn and maintaining long-term skin health. Typically, you can expect UV Index values to rise sharply by mid-morning, reaching a maximum of 11 around noon, highlighting the importance of sun safety practices in this sun-kissed region. Stay informed, stay protected!

Hourly UV Index in Sisters

The UV Index throughout the day follows a predictable rise and fall, peaking at 11 around 1:00 PM. Starting at a modest 1 at 7:00 AM, it gradually escalates, reaching 10 by 12:00 PM, signaling the need for sun protection. As the afternoon progresses, the index dips from 11 to 8 by 3:00 PM, then declines further to 2 by 6:00 PM, and finally settles back at 1 by 7:00 PM. This data underscores the importance of taking precautions during the hours of peak UV exposure, particularly between 11:00 AM and 3:00 PM, when levels are highest and pose the greatest risk to skin health.

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	11	extreme	10 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 Sisters

Throughout the year, the UV Index reveals notable seasonal variations, indicating periods of higher risk for sun exposure. From March to September, particularly in May, when the UV index reaches an extreme value of 11, residents and visitors should exercise caution. April and June also present significant risks with very high indices of 8 and 10, respectively, suggesting burn times as short as 10–15 minutes. In contrast, the months of January and February have moderate UV levels with longer burn times of 30 minutes, while November and December show a marked decline in UV exposure. As summer months approach, it is imperative to seek shade, wear protective clothing, and apply sunscreen generously to minimize skin damage during high-risk months.

Monthly Maximum UV Index for Sisters, United States

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

The table above highlights how UV exposure in Sisters 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.

Sisters'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
Sisters	3	4	6	8	11	10	10	9	8	6	3	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