Last updated: May 3, 2025
Understanding the UV Index in Mission Viejo is crucial for protecting your skin and overall health. With peak UV levels reaching as high as 11 during the midday hours, residents and visitors alike should be aware of the risks of sunburn and long-term skin damage. This region's BSk climate, characterized by warm, dry summers, can lead to increased UV exposure, making it essential to monitor these levels regularly. By staying informed about the UV Index, you can take proactive measures to safeguard your skin and enjoy the sunny California outdoors responsibly.
At 07:00, the UV Index begins its climb with a modest level of 1. By 08:00, it doubles to 2, signaling the start of a gradual increase in solar intensity. As the sun rises higher, the index swiftly escalates to 4 by 09:00 and reaches a brisk 7 at 10:00. The peak occurs at 12:00, hitting a notable 10, and it continues to soar, reaching its maximum of 11 by 13:00. After this midday peak, the UV Index begins to decline, dropping to 9 at 14:00 and gradually decreasing to 7 by 15:00. As the afternoon progresses, it further retreats to 5 at 16:00 and falls to 3 by 17:00, finally settling back to 1 at 18:00 and 19:00. This prompts a reminder to take essential sun protection during the day, especially when the index is at its highest!
| 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 | 7 | 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 | 9 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
As the seasons change, so do the UV index levels, significantly impacting sun safety practices. January sees a moderate UV index of 4, allowing for 30 minutes of potential sun exposure. However, by February, the UV index rises to 6 (high), reducing safe burn time to 25 minutes. The risk escalates from March through July, with values peaking at 11 (extreme) during May and June, necessitating caution with just 10 minutes of safe exposure. August and September remain high at 10 (very high), with 15 minutes of burn time, before a gradual decline begins in October with a 7 (high) index. Throughout November and December, the index returns to a moderate 5 and 4, allowing for safe exposure up to 30 minutes. For both visitors and residents, it is crucial to be particularly vigilant during the high-risk months of March to September, taking proactive measures such as wearing sunscreen, protective clothing, and seeking shade during peak sun hours to safeguard against harmful UV radiation.
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 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Mission Viejo | 4 | 6 | 8 | 10 | 11 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |