UV Index in Lewiston, United States

Last updated: June 2, 2025

In Lewiston, United States, awareness of the UV Index is crucial for safeguarding your skin against the sun’s harmful rays. Understanding the UV levels can help residents and visitors alike prevent sunburn and long-term skin damage, promoting overall skin health. With a Dfb climate that experiences intense summer sun, the UV Index can peak at a striking 12 around midday, indicating a high risk for skin harm. By staying informed about the UV Index, you can enjoy the outdoors while taking the necessary precautions to protect yourself and your loved ones from excessive UV exposure.

Hourly UV Index in Lewiston

As the sun rises, the UV Index begins its steady climb, starting at 1 by 7:00 AM. By 8:00 AM, it barely nudges to 2, but as the day progresses, so does the intensity of UV rays. At 10:00 AM, the index reaches 6, a clear signal to start protecting your skin. The peak arrives at 12:00 PM with a blistering 11, followed closely by a slight drop to 10 by 3:00 PM. The afternoon sees a gradual decline, dipping to 3 by 6:00 PM, wrapping up a day where vigilance against UV exposure was paramount. Remember, from 11:00 AM to 3:00 PM, your skin deserves extra care as the UV rays are at their strongest!

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	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Lewiston

Throughout the year, the UV Index exhibits notable seasonal variations, with the most significant increases occurring from March through September. High-risk months for UV exposure are April to August, when the index reaches extreme levels (11-12), resulting in a burn time as brief as 10 minutes. As a precaution, both visitors and residents should exercise caution during these months by seeking shade, wearing protective clothing, and applying broad-spectrum sunscreen frequently. In contrast, January, February, October, and November show moderate levels of UV exposure, with longer burn times of 30 minutes, indicating a reduced risk but still warranting protective measures when outdoors. Awareness of these changes will help individuals enjoy sun exposure safely throughout the year.

Monthly Maximum UV Index for Lewiston, United States

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

The table above highlights how UV exposure in Lewiston 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.

Lewiston'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
Lewiston	3	5	8	10	11	12	11	11	9	6	5	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