UV Index in Nampa, United States

Last updated: July 2, 2025

In Nampa, United States, awareness of the UV Index is crucial for maintaining skin health and preventing sunburns. Understanding UV levels helps residents make informed choices about sun protection, especially during the peak hours when UV exposure can reach dangerous levels, such as a daunting 11 between 1:00 PM and 2:00 PM. With Nampa's semi-arid climate (BSk), the sun can be particularly intense, heightening the risk of skin damage. By staying informed about the UV Index, you can enjoy the outdoors while safeguarding your skin from harmful effects.

Hourly UV Index in Nampa

During the day, the UV Index peaks sharply, reaching its maximum at 2 PM with a level of 11, indicating intense ultraviolet radiation. As the sun rises, the index starts low at 1 at 7 AM and 8 AM, gradually climbing until it hits 7 by 11 AM. The intensity continues to escalate, reaching 9 at noon and hitting the day’s high of 10 at 1 PM. Following the afternoon peak, the index begins to fade, dropping to 8 by 4 PM, and then gently tapering off to 5 at 5 PM, before concluding the day with lower readings of 3 at 6 PM and 2 at 7 PM. For those venturing outdoors, it’s crucial to take precautions against sun exposure, particularly between noon and 2 PM when the UV risk 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	1	low	45 min
09:00	3	moderate	30 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	11	extreme	10 min
15:00	10	very high	15 min
16:00	8	very high	15 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	2	low	45 min

Monthly UV Index Trends in Nampa

Throughout the year, the UV Index experiences significant fluctuations, peaking during the summer months. The highest risk comes in June and July, when the UV Index reaches 11, categorized as extreme, with a burn time of only 10 minutes. April and May also pose considerable risk with UV Index values of 8 and 10, respectively, requiring vigilance as the burn time drops to 15 minutes. In contrast, the winter months of January and December present the lowest UV exposure, with index levels of 3 and 2, allowing for a safer burn time of 30 to 45 minutes. Visitors and residents should take precautions during the high-risk months by wearing protective clothing, applying broad-spectrum sunscreen, and seeking shade to minimize the risk of sunburn and long-term skin damage.

Monthly Maximum UV Index for Nampa, United States

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

The table above highlights how UV exposure in Nampa 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.

Nampa'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
Nampa	3	5	6	8	10	11	11	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