Last updated: June 2, 2025
Understanding the UV Index in Henderson, United States is crucial for maintaining your skin health and preventing sunburn. With its Cfa climate, Henderson experiences significant UV exposure, particularly during midday hours when the index can soar as high as 11. Being aware of the UV levels helps residents make informed decisions about outdoor activities and sun protection, ensuring that fun in the sun doesn't come with the cost of skin damage. Whether you're enjoying a day at the park or simply taking a stroll, understanding the UV Index is key to staying safe under Henderson's bright skies.
As the sun rises, the UV Index starts off gently at 1 by 7:00 AM, gradually climbing as the day progresses. By 10:00 AM, it reaches 6, signaling a notable increase in solar radiation. The intensity peaks at 12:00 PM with a striking 10 and continues to soar to a maximum of 11 at 1:00 PM, marking the hour of greatest exposure. As the afternoon unfolds, the index begins to taper off—dropping to 10 at 2:00 PM and 8 by 3:00 PM. By late afternoon, the UV Index gracefully descends to 4 at 5:00 PM, settling back to 2 by 6:00 PM and finally returning to a gentle 1 by 7:00 PM. This highlights the importance of sun protection during mid-day when UV rays are at their most intense.
| 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 | 6 | high | 25 min |
| 11:00 | 8 | 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 index levels exhibit significant seasonal variations, indicating fluctuating sun exposure risks. The high-risk months typically occur from March to August, with peak UV levels recorded in May, June, and July, where the index reaches an extreme 11 and the burn time reduces to just 10 minutes. During this period, it is crucial for visitors and residents to take protective measures, such as wearing sunscreen with high SPF, donning protective clothing, and seeking shade during midday hours. As summer transitions into autumn, the UV index gradually declines; however, it remains at very high levels through September and October. By late fall and winter, the UV index decreases to moderate levels in November and December, making sun safety less critical, but still advisable. Staying aware of these seasonal changes can help everyone enjoy the outdoors safely.
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 |
| Henderson | 3 | 6 | 7 | 10 | 11 | 11 | 11 | 10 | 9 | 8 | 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 |