UV Index in Lewiston, United States

Last updated: June 2, 2025

In Lewiston, United States, understanding the UV Index is essential for protecting your skin and overall health. With peak UV levels reaching as high as 10 during the noon hours, residents and visitors must remain vigilant against sunburn and long-term skin damage. Known for its Dfa climate, Lewiston experiences a range of UV exposure risks, particularly in the warmer months when sun intensity escalates. By staying informed about daily UV levels, you can take proactive measures—like wearing sunscreen or seeking shade—to ensure your skin remains healthy under the summer sun.

Hourly UV Index in Lewiston

Today's UV Index presents an intriguing curve, starting the day with a mellow maximum of 1 at 07:00. As the sun climbs higher, things heat up quickly—by 10:00, the index reaches 6, and by 12:00, it peaks at an intense 10. This level remains steady until 14:00, urging sun enthusiasts to take precautions. As the afternoon fades, the UV Index gracefully tapers off, dropping to 4 by 17:00, and finally sinking back to a gentle 1 by 19:00. With mid-day UV levels soaring, it’s crucial to stay protected during those peak hours!

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	10	very high	15 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 Lewiston

Throughout the year, seasonal UV changes significantly impact exposure levels, with the highest UV Index recorded during the summer months. High-risk months include April through September, where the UV Index reaches very high levels of 8 to 10, leading to a burn time as short as 15 minutes. In contrast, January and December present lower UV levels, categorized as low, allowing for burn times of up to 45 minutes. Visitors and residents are strongly advised to take precautions during high-risk months by applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of skin damage.

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
Lewiston	2	4	5	8	9	10	10	9	8	5	3	2
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
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