UV Index in Allentown, United States

Last updated: July 2, 2025

Understanding the UV Index in Allentown, United States, is crucial for safeguarding your skin health and preventing sunburn. With a humid subtropical climate, this region experiences varying UV levels, peaking during the midday hours, notably reaching 11 to 12 around noon. By staying informed about UV exposure risks, you can enjoy outdoor activities while taking necessary precautions to protect your skin from harmful solar radiation. Whether lounging in the park or enjoying a stroll downtown, awareness of the UV Index can make a significant difference in your sunny adventures in Allentown!

Hourly UV Index in Allentown

The UV Index starts off gently at 07:00 with a low reading of 1, offering a safe outdoor experience. As the sun climbs, the intensity increases, peaking sharply at 12:00 with an index of 11, a point where sun protection is crucial. The highest exposure occurs around 13:00, reaching 12, before gradually tapering off in the afternoon. By 14:00, the UV Index remains high at 11, but begins to decline, dropping to 8 by 15:00. As the evening approaches, the risk diminishes significantly, with values falling to 3 at 17:00, and back to a manageable 1 by 18:00 and 19:00. To enjoy the outdoors safely, it's essential to stay protected during 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	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	8	very high	15 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 Allentown

Throughout the year, UV levels fluctuate, with high-risk months primarily falling between February and August. Notably, April to July feature an extreme UV Index of 11 to 12, necessitating precautions to limit sun exposure to just 10 minutes during peak hours. February and March present significant risks as well, with very high UV levels of 8 and 9, leading to burn times of only 15 minutes. To safeguard your skin, residents and visitors are advised to minimize exposure during peak sun hours, wear protective clothing, and use broad-spectrum sunscreen. As the year progresses, November and December offer lower UV levels, classified as high and moderate, respectively, allowing for longer safe exposure times of 25 to 30 minutes.

Monthly Maximum UV Index for Allentown, United States

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

The table above highlights how UV exposure in Allentown 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.

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