Last updated: May 3, 2025
Understanding the UV Index is essential for residents of San Rafael, as it plays a crucial role in protecting your skin from harmful ultraviolet rays. Regularly monitoring UV levels helps prevent sunburn and long-term skin damage, safeguarding your overall skin health. With San Rafael's typical climate characterized by warm, dry summers and an increased risk of UV exposure, being proactive about sun safety becomes even more important. At peak hours, especially between 12 PM and 2 PM, the UV Index can soar to 12, indicating a high risk of harm. Stay informed and enjoy the sunny days safely!
The UV Index today presents a clear picture of sun intensity throughout the day. Starting off at a gentle 1 at 07:00, it gradually escalates to a moderate 4 by 09:00. The real intensity kicks in around 10:00, peaking at 12 from 12:00 to 14:00—making it crucial to take sun safety precautions during this window. As the afternoon progresses, the index begins to decline, dropping to 10 by 15:00 and then retreating back to 4 by 17:00. The evening sees a gentle fade to a light 2 at 18:00, finally settling back at a low 1 by 19:00. Enjoy the sun but remember, protection is key when the UV Index peaks!
| 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 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 12 | extreme | 10 min |
| 15:00 | 10 | very high | 15 min |
| 16:00 | 7 | 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 exposure varies significantly, with the highest risk months being April through September when the UV Index frequently reaches extreme levels of 11 to 13. This period sees a dramatic drop in safe burn time to just 10 minutes, indicating strong precaution is necessary. In contrast, January and December represent the lowest risk months with a moderate exposure category and longer burn times of 30 minutes. Visitors and residents are advised to be particularly vigilant during the high-risk months: applying sunscreen, wearing protective clothing, and seeking shade during peak hours to minimize harmful UV exposure. Remember, even on cloudy days or during cooler months, UV rays can still pose a risk, so it's essential to stay informed and protected year-round.
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 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |
| San Rafael | 5 | 7 | 9 | 11 | 12 | 13 | 13 | 12 | 11 | 8 | 6 | 4 |