UV Index in Washington, United States

Last updated: June 2, 2025

In Washington, understanding the UV Index is crucial for safeguarding your skin and overall health. As you enjoy the beautiful Pacific Northwest, being aware of UV levels can help you prevent sunburn and long-term skin damage. The typical Cfa climate here brings a unique mix of overcast days and sunny spells, which can often lead to underestimated UV exposure. For instance, during peak midday hours, the UV Index soars to 10, highlighting the importance of protection. Stay informed and embrace the sun safely!

Hourly UV Index in Washington

The UV Index reveals a dynamic ascent and descent throughout the day, peaking with intensity during midday. Starting at a gentle 1 at 7:00 AM, it climbs steadily, reaching 10 by 1:00 PM and maintaining this highest level until 2:00 PM. This critical window indicates significant sun exposure, and it’s essential to take precautions. As the afternoon progresses, the index begins to taper off, dropping to 8 at 3:00 PM, then gradually falling to 1 by 7:00 PM. This data highlights the importance of being sun-smart during the peak hours to minimize UV exposure risks.

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	5	moderate	30 min
11:00	8	very high	15 min
12:00	9	very high	15 min
13:00	10	very high	15 min
14:00	10	very high	15 min
15:00	8	very high	15 min
16:00	6	high	25 min
17:00	4	moderate	30 min
18:00	2	low	45 min
19:00	1	low	45 min

Monthly UV Index Trends in Washington

Throughout the year, the UV Index experiences significant seasonal variations, with high-risk months primarily occurring from March to September. In March, the UV Index reaches 7 (high), and this escalates to 11 (extreme) in May, which indicates a critical need for sun protection. The UV Index remains at very high levels (10) from April to August, highlighting the importance of minimizing sun exposure during this time. As the summer months progress, burn times decrease dramatically, with only 10-15 minutes of exposure being safe in peak months. Conversely, the UV Index drops back to moderate levels in November and December, allowing for safer outdoor activities. Residents and visitors should prioritize sun safety through appropriate clothing, sunscreen, and seeking shade, particularly during high-risk months when UV radiation is more intense.

Monthly Maximum UV Index for Washington, United States

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

The table above highlights how UV exposure in Washington 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.

Washington'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
Washington	3	5	7	10	11	10	10	10	8	7	5	3
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