UV Index in Juneau, United States

Last updated: June 2, 2025

Understanding the UV Index is crucial for residents and visitors in Juneau, United States, especially during the summer months when the sun's rays can be particularly strong. With UV levels peaking at 8 around noon, awareness of these indices is vital for preventing sunburn and protecting skin health. Juneau's Dfc climate features cool summers, but that doesn't diminish the risk of harmful UV exposure when the sun shines. By staying informed about local UV levels, you can enjoy the beautiful outdoors while keeping your skin safe from the sun's damaging effects.

Hourly UV Index in Juneau

As the sun rises, the UV Index starts at a mild 2 by 7:00 AM, making it a great time for early activities. By 9:00 AM, it climbs to 4, signaling that sun protection is becoming more important. The intensity peaks at 12:00 PM and 1:00 PM, reaching a maximum of 8, so it’s wise to seek shade and wear sunscreen during these hours. Gradually, the index begins to decline; by 3:00 PM, it drops to 6, and continues to decrease to 1 by 7:00 PM. This data highlights the importance of monitoring UV levels throughout the day to ensure safe sun exposure.

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	2	low	45 min
08:00	3	moderate	30 min
09:00	4	moderate	30 min
10:00	5	moderate	30 min
11:00	7	high	25 min
12:00	8	very high	15 min
13:00	8	very high	15 min
14:00	7	high	25 min
15:00	6	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 Juneau

The UV Index displays significant seasonal variation, with high-risk months occurring from May to August, when the UV Index reaches its peak at levels 8 to 9, indicating a very high exposure category and a quick burn time of just 15 minutes. In contrast, the winter months of January, February, November, and December exhibit a low UV Index of 1, allowing for safer sun exposure with no risk of quick burns. The transition period from March to April sees a moderate risk level with UV indices of 4 to 5, necessitating caution as burn times decrease to 30 minutes. Residents and visitors are advised to prioritize sun safety measures, particularly during the high-risk months by wearing protective clothing, applying sunscreen frequently, and seeking shade to minimize the risk of skin damage.

Monthly Maximum UV Index for Juneau, United States

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

The table above highlights how UV exposure in Juneau 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.

Juneau'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
Juneau	1	2	4	5	8	8	9	9	6	3	1	1
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