Last updated: June 2, 2025
In Washington, United States, staying aware of the UV Index is essential for maintaining skin health and preventing sunburn. Understanding the daily UV levels can help you take the necessary precautions, especially during peak hours when the index can reach as high as 11. The region's Cfa climate brings variable weather, but on clear days, UV exposure can be significant, particularly from late morning until early afternoon. By keeping an eye on the UV Index, you can enjoy the outdoors safely while protecting your skin from harmful rays.
The UV Index data highlights a dramatic rise in sun intensity as the day progresses. Starting early at 1 around 7:00 AM, it gradually climbs to 10 by noon, peaking at a staggering 11 at 1:00 PM. This is the moment when UV exposure becomes most concerning, emphasizing the importance of sun protection. As the afternoon unfolds, the index gracefully tapers down, dipping to 8 by 3:00 PM and further declining to 4 by 5:00 PM. By the time evening rolls in, the UV Index settles back to 1 at 7:00 PM, signaling a reprieve from the midday sun. This data can be a crucial guide for planning outdoor activities safely throughout the day.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 6 | high | 25 min |
| 11:00 | 9 | very high | 15 min |
| 12:00 | 10 | very high | 15 min |
| 13:00 | 11 | extreme | 10 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 |
Throughout the year, UV radiation levels fluctuate significantly, with high-risk months occurring between April and August where the UV Index reaches very high to extreme levels. Specifically, April (UV Index 9) and May (UV Index 10) present increased risks, with a burn time of just 15 minutes in May. The peak intensity is seen in June and July, where the UV Index hits 11, categorizing it as extreme; here, just 10 minutes of unprotected exposure can result in burns. As summer transitions into fall, the UV Index gradually decreases, indicating a safer exposure period, but caution is still necessary in September (UV Index 9) and October (UV Index 7). For both residents and visitors, it is advisable to take appropriate sun safety measures during the high-risk months, such as wearing protective clothing, using sunscreen, and seeking shade during peak hours to prevent skin damage.
UV Risk Categories
| 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 | 6 | 9 | 10 | 11 | 11 | 10 | 9 | 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 |