UV Index in Pierce, United States

Last updated: July 2, 2025

Understanding the UV Index is crucial for residents of Pierce, United States, as it significantly impacts sun safety and skin health. With UV levels peaking at a striking 12 during midday, awareness can help prevent painful sunburns and long-term skin damage. Pierce experiences a BSk climate, characterized by variable sun exposure that can lead to higher UV risks, especially in the summer months. By keeping an eye on the UV Index, you can enjoy the outdoors while protecting yourself and your loved ones from the harmful effects of the sun.

Hourly UV Index in Pierce

Throughout the day, the UV Index displayed a dynamic pattern, peaking at an intense 12 around 1 PM. Starting off gently at 1 by 7 AM, it climbed steadily, reaching 9 by 11 AM, a clear sign to take precautions. As the sun approached its zenith, the index swelled to its maximum at 12 PM, emphasizing the importance of sun safety. Following the midday peak, the index gradually decreased, dropping to 9 by 3 PM, then tapering off further to 2 by 6 PM and 1 by 7 PM. This data underscores the significance of shielding oneself from the sun's harmful rays during the day, especially 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	7	high	25 min
11:00	9	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	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Pierce

As the seasons change, UV exposure varies significantly. January and February have a moderate UV Index of 4 and 5, respectively, allowing for up to 30 minutes of sun exposure before burning occurs. In March, the index rises to 7, marking the start of the high-risk category, where just 25 minutes can lead to burns. The peak risk months are April through July, where the UV Index reaches an extreme level of 12, necessitating careful sun protection and limiting exposure to 10 minutes. As summer wanes, August and September still present high risks with UV readings of 10 and 9, allowing for up to 15 minutes exposure. By October, UV levels decrease to 6, followed by moderate levels again in November and December. Residents and visitors should remain vigilant, especially during the high and extreme UV months, applying sunscreen, wearing protective clothing, and seeking shade when necessary to minimize the risk of skin damage.

Monthly Maximum UV Index for Pierce, United States

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

The table above highlights how UV exposure in Pierce 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.

Pierce'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
Pierce	4	5	7	10	10	12	12	10	9	6	4	3
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