UV Index in Waikapu, United States

Last updated: July 2, 2025

Understanding the UV Index in Waikapu, United States, is crucial for maintaining skin health and preventing harmful sunburns. With the region's tropical climate and high UV exposure—particularly between 10 AM and 2 PM when values soar to harmful levels (up to 13)—being aware of these UV levels can significantly reduce the risk of skin damage. By monitoring the UV Index, residents and visitors can take proactive measures to protect themselves during outdoor activities, ensuring a healthy and safe experience under the Hawaiian sun.

Hourly UV Index in Waikapu

The UV Index presents a compelling story of sun intensity throughout the day, peaking in the early afternoon. Starting modestly at 1 at 07:00, it swiftly escalates, reaching 3 by 08:00 and climbing steadily to a striking 13 at 12:00. The highest point occurs at 11:00 and 12:00, with an intense UV Index of 13, signaling a need for sun protection. As the day progresses, the index declines, tapering off to 8 at 15:00 and then further down to 2 by 17:00. Finally, the sun sets, and the UV Index drops to 0 by 19:00, marking the end of the day's sun exposure. This data emphasizes the importance of taking precautions during midday hours when UV radiation is at its most potent.

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	3	moderate	30 min
09:00	5	moderate	30 min
10:00	9	very high	15 min
11:00	11	extreme	10 min
12:00	13	extreme	10 min
13:00	13	extreme	10 min
14:00	11	extreme	10 min
15:00	8	very high	15 min
16:00	5	moderate	30 min
17:00	2	low	45 min
18:00	1	low	45 min
19:00	0	low	45 min

Monthly UV Index Trends in Waikapu

The UV Index experiences significant seasonal variations, peaking during the spring and summer months. From March to October, the UV Index reaches an extreme level of 11 to 13, indicating a burn time as short as 10 minutes, making these months particularly high-risk for sunburn and skin damage. Visitors and residents should exercise extreme caution during this period, wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade during peak hours. Conversely, January, February, November, and December present a very high UV Index of 8, with a longer burn time of 15 minutes. While these months pose a lower risk than the summer, it's still advisable to remain vigilant about sun protection.

Monthly Maximum UV Index for Waikapu, United States

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

The table above highlights how UV exposure in Waikapu 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.

Waikapu'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
Houston UVI	5	8	9	11	11	12	12	11	10	9	7	5
Waikapu	8	10	11	12	12	13	13	13	13	11	8	8