UV Index in Harleysville, United States

Last updated: July 2, 2025

Understanding the UV Index in Harleysville, United States, is crucial for protecting your skin and overall health. With UV levels peaking at a high of 10 during midday, it's essential for residents and visitors alike to stay informed about sun exposure to prevent sunburn and long-term skin damage. Harleysville, characterized by its Cfa climate, experiences varied weather conditions, which can influence UV exposure throughout the year. By keeping an eye on the UV Index, you can enjoy the sunny days while safeguarding your skin against harmful rays.

Hourly UV Index in Harleysville

At sunrise, the UV Index starts gently at 1 around 07:00, whispering the promise of a bright day. As the clock ticks, it climbs steadily, reaching 2 by 08:00 and 3 by 09:00. The real intensity kicks in at 10:00, spiking to 6, and by 11:00, it jumps to 8. The peak occurs at 13:00, hitting a robust 10, a clear reminder to seek shade or don protection. As afternoon drifts toward evening, the index gracefully descends: it remains strong at 9 at 14:00, then eases to 7 at 15:00, 5 at 16:00, and finally back to 3, 2, and a calm 1 by 19:00. Enjoy the sun responsibly!

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	3	moderate	30 min
10:00	6	high	25 min
11:00	8	very high	15 min
12:00	9	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	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Harleysville

Throughout the year, UV exposure varies significantly, peaking during late spring and summer months. High-risk months for UV exposure are April through September, where the UV Index frequently reaches levels classified as very high; particularly notable are May, June, and July, when it consistently hits a maximum of 10. Visitors and residents are advised to take precautions during these months, with burn times dramatically reduced to as little as 15 minutes. In contrast, January, February, and November present moderate UV levels, and December has a low index, making sun safety measures less critical during these months. To protect against skin damage, it is essential to wear sunscreen, seek shade, and wear protective clothing, especially between peak months of April and September.

Monthly Maximum UV Index for Harleysville, United States

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

The table above highlights how UV exposure in Harleysville 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.

Harleysville'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
Harleysville	3	5	6	9	10	10	10	9	8	6	4	2
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