UV Index in Joliet, United States

Last updated: July 2, 2025

In Joliet, United States, staying aware of the UV Index is crucial for protecting your skin and overall health. Understanding UV levels is essential for preventing sunburn and reducing the risk of long-term skin damage. With a BSk climate that experiences significant sun exposure, residents should be particularly vigilant during peak hours, as UV Index levels can soar to a striking 10 around midday. By monitoring these levels, you can enjoy the sunny days while safeguarding your skin from harmful effects.

Hourly UV Index in Joliet

The UV index begins its ascent at 07:00, starting at a gentle 1, then climbs gradually through the morning. By 10:00, it reaches a moderate 5, but from 11:00 onwards, the sun's intensity becomes pronounced, peaking at an impressive 10 between 13:00 and 14:00. After this zenith, the index dips to 8 at 15:00 and continues its decline, settling back to 2 by 18:00. As the day winds down into the evening, the UV index drops to a low 1 by 19:00, signaling a return to safer sun exposure levels. Enjoy the sunshine while staying protected during the high points!

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	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 Joliet

Throughout the year, the UV Index exhibits notable seasonal variations, with high-risk months primarily occurring from March to September. During this period, particularly in June with an extreme UV Index of 11 and April to August, which consistently sees values between 8 and 10, individuals are at increased risk of sunburn with burn times decreasing to as little as 10 minutes. Conversely, the winter months of December and January reflect a lower UV Index, ranging from 2 to 3, providing a safer environment for sun exposure with burn times extending up to 45 minutes. It is advisable for visitors and residents to take protective measures during the high-risk months, including wearing sunscreen, protective clothing, and seeking shade, especially during peak sun hours.

Monthly Maximum UV Index for Joliet, United States

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

The table above highlights how UV exposure in Joliet 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.

Joliet'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
Joliet	3	5	6	8	9	11	10	9	8	5	3	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