UV Index in Boise, United States

Last updated: May 3, 2025

Understanding the UV Index in Boise is crucial for safeguarding your skin health in this picturesque city nestled in a Csb climate zone. As temperatures rise, so do UV levels, peaking at 10 from noon to early afternoon, when sunburn risks are highest. By staying informed about the UV Index, residents and visitors can take proactive steps to prevent sunburn and long-term skin damage. With Boise's sunny days and outdoor lifestyle, being aware of daily UV exposure not only helps you enjoy the beautiful Idaho outdoors safely but also promotes healthier skin for years to come.

Hourly UV Index in Boise

The UV Index reveals a significant rise in sun exposure throughout the day, starting from a gentle 1 at 07:00 and 08:00, indicating minimal risk. By 09:00, it bumps up to 2, but it's at 10:00 that things get serious with a steep climb to 4. The sun peaks between 12:00 and 14:00, where the UV Index hits a striking 8 and reaches its max of 10 at 13:00, signaling a high risk for unprotected skin. As the day progresses, the intensity gradually diminishes, descending to 7 at 16:00, 5 at 17:00, and returning to a safe 1 by 19:00. It’s a clear reminder to stay protected during the 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	1	low	45 min
09:00	2	low	45 min
10:00	4	moderate	30 min
11:00	7	high	25 min
12:00	8	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	9	very high	15 min
16:00	7	high	25 min
17:00	5	moderate	30 min
18:00	3	moderate	30 min
19:00	1	low	45 min

Monthly UV Index Trends in Boise

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 Boise, United States

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

The table above highlights how UV exposure in Boise 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.

Boise'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
Boise	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