UV Index in Monrovia, United States

Last updated: July 2, 2025

Understanding the UV Index in Monrovia, United States, is crucial for protecting your skin and overall health. With rising UV levels throughout the day, particularly peaking around noon with an intense UV Index of 12, awareness is essential to prevent sunburn and long-term skin damage. Monrovia's Csb climate brings a unique combination of mild temperatures and clear skies that can amplify sun exposure risks. Regularly checking the UV Index empowers residents and visitors alike to enjoy the outdoors while keeping their skin safe from harmful rays.

Hourly UV Index in Monrovia

The UV Index today presents a dynamic shift, starting from a low 1 at 07:00 and peaking at a striking 12 around 13:00. Between 10:00 and 14:00, the sun is at its most intense, with readings soaring to 11 and 12—a clear reminder to seek shade and apply sunscreen. As the afternoon progresses, the intensity begins to wane, dropping to 9 by 15:00 and further declining to 3 at 17:00. The evening brings a gentle relief, with the UV Index falling to 1 by 19:00. Stay vigilant and protect yourself 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	7	high	25 min
11:00	10	very high	15 min
12:00	11	extreme	10 min
13:00	12	extreme	10 min
14:00	11	extreme	10 min
15:00	9	very high	15 min
16:00	6	high	25 min
17:00	3	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Monrovia

Throughout the year, the UV Index experiences significant fluctuations, with the highest levels occurring from March to August. March and April both exhibit a very high UV Index of 9 and 10, respectively, leading to a burn time of only 15 minutes. The peak months, May and June, are classified as extreme with a UV Index of 11 and 12, necessitating caution as the burn time reduces to just 10 minutes. July and August continue this trend, remaining in the extreme category, before a gradual decline in September to 10 (very high) and further down to high with an Index of 7 in October. The year wraps up with moderate levels in November and December, where the burn time increases to 30 minutes. Given these variations, residents and visitors should take extra precautions from March through October, particularly during May and June, by wearing protective clothing, applying high-SPF sunscreen, and seeking shade to minimize their risk of sunburn and long-term skin damage.

Monthly Maximum UV Index for Monrovia, United States

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

The table above highlights how UV exposure in Monrovia 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.

Monrovia'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
Monrovia	4	6	9	10	11	12	12	11	10	7	5	4
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5