UV Index in Pomona, United States

Last updated: May 3, 2025

In Pomona, California, awareness of the UV Index is crucial for safeguarding your health, especially as the region experiences a Csb climate, characterized by mild, wet winters and warm, dry summers. Understanding UV levels is essential for protecting your skin from harmful ultraviolet radiation, as even brief exposure can lead to sunburn and long-term skin damage. With peak UV readings reaching a staggering 10 around midday, it's vital for residents and visitors to stay informed about daily UV forecasts and take proactive measures to ensure their skin's health under the California sun.

Hourly UV Index in Pomona

The UV Index throughout the day presents a clear escalation and decline in sun exposure risk. Starting at a mild level 1 at 7:00 AM, it gradually climbs to a notable level 10 by noon, indicating peak midday sunlight intensity. The zenith occurs between 12:00 PM and 1:00 PM, where the index remains at 10, necessitating protective measures against harmful UV rays. As the afternoon progresses, the UV Index begins to taper off, dipping to level 7 by 3:00 PM and eventually returning to level 1 by 7:00 PM. To ensure skin health and safety, sun protection is essential during those high-risk hours around midday!

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	10	very high	15 min
13:00	10	very high	15 min
14:00	9	very high	15 min
15:00	7	high	25 min
16:00	5	moderate	30 min
17:00	3	moderate	30 min
18:00	1	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Pomona

During the year, UV Index values show significant seasonal variation, peaking in the summer months. High-risk months for UV exposure include March through August, particularly notable in June and July, where the UV Index reaches an extreme level of 12 and 11, respectively, with a burn time of only 10 minutes. Visitors and residents are advised to take necessary precautions during these months, such as wearing protective clothing, using broad-spectrum sunscreen, and limiting sun exposure, especially between 10 AM and 4 PM. As UV levels decrease from September onward, with moderate levels returning in the winter months of November and December, maintaining sun safety remains important, especially during high-exposure periods.

Monthly Maximum UV Index for Pomona, United States

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

The table above highlights how UV exposure in Pomona 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.

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