UV Index in Norco, United States

Last updated: May 3, 2025

Understanding the UV Index is crucial for residents of Norco, United States, where sunny days are plentiful. Awareness of UV levels not only helps prevent painful sunburns but is essential for maintaining long-term skin health. In this California city, the climate provides ample exposure to UV rays, with peak levels reaching a striking 12 around midday. Familiarizing yourself with the UV Index empowers you to take proactive steps to protect your skin while enjoying the beautiful Norco outdoors!

Hourly UV Index in Norco

The UV Index for the day exhibits a striking climb as the sun rises, starting at a mild 1 by 07:00 and steadily increasing to reach its peak at 12 by 13:00. During the sun's zenith, particularly between 11:00 and 13:00, the UV Index soars to a high of 11, signaling a strong need for protection against harmful rays. As afternoon transitions to evening, the index gracefully declines; it drops to 8 by 15:00, then further diminishes to 1 by 19:00. For a safe outdoor experience, it’s crucial to stay vigilant and protect your skin especially during the peak hours when the UV Index is 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	2	low	45 min
09:00	4	moderate	30 min
10:00	6	high	25 min
11:00	9	very high	15 min
12:00	11	extreme	10 min
13:00	12	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	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Norco

Throughout the year, UV Index levels exhibit notable seasonal changes, peaking during the summer months. High-risk months for sun exposure occur from February to August, where UV Index levels reach very high to extreme values, particularly in April, May, June, and July, with indexes of 11 to 12 and a burn time as short as 10 minutes. Residents and visitors should exercise caution during these months by seeking shade, wearing protective clothing, and applying sunscreen frequently. As we transition into fall and winter, UV levels gradually decrease, with November and December presenting lower risk (UV Index of 6 and 5, respectively), allowing for slightly longer burn times of 25 to 30 minutes. Nevertheless, awareness remains crucial year-round, as moderate UV exposure can still cause adverse effects.

Monthly Maximum UV Index for Norco, United States

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

The table above highlights how UV exposure in Norco 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.

Norco'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
Los Angeles UVI	4	6	8	9	10	11	11	10	10	7	5	4
Norco	5	8	9	11	11	12	12	11	10	9	6	5
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5