UV Index in Portage, United States

Last updated: July 2, 2025

Understanding the UV Index is essential for residents of Portage, United States, as it serves as a crucial indicator of daily sun exposure and potential risks. With UV levels varying throughout the day, being informed can help you take proactive steps to prevent sunburn and protect your skin health. In Portage's Dfa climate, the summer months can bring intense sun exposure, particularly between noon and 3 PM when the UV index peaks at 10. By staying aware of these fluctuations, you can enjoy the outdoors while ensuring your skin remains safe from harmful rays.

Hourly UV Index in Portage

The UV Index shows a clear trajectory of increasing intensity as the day unfolds. Starting from a mild level of 1 at 7:00 AM, it gradually ascends to 2 by 9:00 AM. The real surge occurs between 10:00 AM and 2:00 PM, peaking at a dangerous 10 at 2:00 PM, indicating a critical need for protection against harmful rays. As the sun begins to descend, the UV Index tapers off, declining to 5 by 5:00 PM, and finally settling back at 1 by 7:00 PM. This data serves as a reminder to stay vigilant under the sun, particularly during those peak hours when UV exposure can be at its highest.

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	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	6	high	25 min
12:00	8	very high	15 min
13:00	9	very high	15 min
14:00	10	very high	15 min
15:00	9	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 Portage

Throughout the year, the UV Index demonstrates significant seasonal changes, with the highest levels occurring during the summer months. From March to August, the UV Index reaches high to very high categories, peaking at 10 in June and July, when the burn time is as little as 15 minutes. The high-risk months for sun exposure are April through August, where individuals should take precautionary measures. Residents and visitors are advised to use sunscreen, wear protective clothing, and seek shade to minimize the risk of skin damage during these months. As the year progresses into fall and winter, the UV Index decreases, reaching a low of 2 in December, where a burn time of 45 minutes is typical; however, caution should still be exercised when outdoors.

Monthly Maximum UV Index for Portage, United States

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

The table above highlights how UV exposure in Portage 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.

Portage'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
Portage	3	4	6	8	9	10	10	9	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