UV Index in Onalaska, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents of Onalaska, United States, where varying climate conditions can lead to significant sun exposure throughout the year. By keeping an eye on UV levels, you can effectively prevent sunburn and protect your skin health. With peak UV Index values reaching 10 during midday, it’s essential to be proactive about sun safety, especially considering the Csb climate zone that can bring bright, sunny days. Be informed, be safe, and enjoy the outdoors while minimizing your risk!

Hourly UV Index in Onalaska

As the sun rises, the UV Index gradually climbs, beginning at a mild 1 at 7:00 AM. By 9:00 AM, it reaches 3, prompting early risers to consider sun protection. The intensity peaks at 1:00 PM with a maximum of 10, signaling the most hazardous conditions for unprotected skin. As the afternoon unfolds, the index dips from 9 at 2:00 PM to 6 by 4:00 PM, offering a brief respite. As the day winds down, the UV rays decrease, falling to 2 by 6:00 PM and returning to a safe 1 by 7:00 PM. Stay mindful of these fluctuations to enjoy the sun while safeguarding your skin!

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	5	moderate	30 min
11:00	7	high	25 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	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 Onalaska

Throughout the year, the UV Index experiences significant seasonal variations, indicating an increase in sun exposure risks during certain months. High-risk months include May, June, July, and August, when the UV Index reaches its peak at 9 to 10 and falls within the very high exposure category. During these months, individuals should limit direct sun exposure, using protective measures such as sunscreen, hats, and UV-blocking clothing, as the burn time can drop to just 15 minutes. Conversely, the low-risk months of January, February, and December, with UV indices of 2 or 3, allow for longer sun exposure safely—up to 45 minutes in winter. As the UV levels fluctuate, it is essential for visitors and residents to stay informed and adapt their sun protection strategies accordingly, particularly during the peak summer months when risks are highest.

Monthly Maximum UV Index for Onalaska, United States

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

The table above highlights how UV exposure in Onalaska 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.

Onalaska'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
Onalaska	2	3	5	6	9	10	9	8	7	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