UV Index in Lewistown, United States

Last updated: June 2, 2025

In Lewistown, United States, staying informed about the UV Index is crucial for protecting your skin and overall health. As you enjoy outdoor activities, understanding the daily UV levels can help you prevent sunburn and reduce the risk of long-term skin damage. With Lewistown's Dfa climate, residents face a range of UV exposure risks, especially during peak hours when the index can reach as high as 11. By keeping an eye on the UV Index, you can enjoy the sun safely while safeguarding your skin and well-being.

Hourly UV Index in Lewistown

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 Lewistown

During the year, UV levels exhibit significant seasonal changes, with March to September being the high-risk months where exposure becomes a notable concern. Starting from March, the UV Index rises sharply, peaking at 11 in June, categorized as extreme with a burn time of just 10 minutes. April and May also present very high risks with a UV Index of 9 and 10, respectively. As the summer progresses, July and August continue with a UV Index of 10, gradually declining to 8 in September. October marks a transition back to elevated, but more manageable, levels, tapering off to moderate exposure in winter months (November and December) with indices at 4 and 3. Residents and visitors should take precautions from March through September by applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of UV-related health issues.

Monthly Maximum UV Index for Lewistown, United States

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

The table above highlights how UV exposure in Lewistown 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.

Lewistown'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
Lewistown	3	5	7	9	10	11	10	10	8	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