UV Index in Portland, United States

Last updated: July 2, 2025

Understanding the UV Index is essential for everyone living in or visiting Portland, United States, where outdoor activities abound amid a temperate climate. With Portland's Dfa climate, UV exposure can vary significantly throughout the day, peaking around noon with levels reaching as high as 10. Recognizing these UV levels is crucial for preventing sunburn and promoting long-term skin health. By staying informed about the UV Index, you can enjoy the sunshine while protecting yourself against potential risks, ensuring your adventures in this vibrant city remain safe and enjoyable.

Hourly UV Index in Portland

The UV Index throughout the day showcased a significant rise, peaking at 10 between 1 PM and 2 PM, indicating the most intense sun exposure. Early morning hours began with a mild UV Index of 1 at 7 AM, gradually climbing to 3 by 9 AM. As the sun climbed higher, it reached 8 at 11 AM, surging to 9 at noon. Following the peak, there was a slight decline, with values dropping to 8 at 3 PM and gradually easing to 1 by 7 PM. For those spending time outdoors, the window between 11 AM and 3 PM necessitated cautious sun protection strategies, while the morning and evening hours offered a more manageable UV exposure.

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	9	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 Portland

Throughout the year, UV exposure varies significantly, peaking during late spring and summer months. High-risk months for UV exposure are April through September, where the UV Index frequently reaches levels classified as very high; particularly notable are May, June, and July, when it consistently hits a maximum of 10. Visitors and residents are advised to take precautions during these months, with burn times dramatically reduced to as little as 15 minutes. In contrast, January, February, and November present moderate UV levels, and December has a low index, making sun safety measures less critical during these months. To protect against skin damage, it is essential to wear sunscreen, seek shade, and wear protective clothing, especially between peak months of April and September.

Monthly Maximum UV Index for Portland, United States

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

The table above highlights how UV exposure in Portland 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.

Portland'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
Portland	3	5	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