Last updated: July 2, 2025
Understanding the UV Index in Saint Johns, United States is crucial for anyone looking to protect their skin from the harmful effects of the sun. With peak UV levels reaching as high as 13 during midday, awareness of these readings can help prevent sunburn and long-term skin damage, ensuring you enjoy the outdoors safely. The BSk climate of Saint Johns brings unique challenges, as sun exposure can be deceptive—even on seemingly mild days. By staying informed about UV levels, you can take proactive measures to safeguard your skin health.
As the sun rises, the UV Index starts off gentle at 2 at 07:00, making it a comfortable time for morning activities. The intensity ramps up quickly, reaching 3 by 08:00, heralding a day of higher UV exposure. By 09:00, the index hits 6, urging caution as midday approaches. The peak arrives between 11:00 and 12:00, with the UV Index soaring to an impressive 12 and then 13, signaling that peak sun intensity is at hand. Even as the clock strikes 13:00, it remains potent at 12 before gradually softening in the following hours. By 15:00, the index drops to 8, finally settling at a milder 2 by 17:00. As evening sets in, the UV levels dwindle, resting at 1 by 18:00 and maintaining that low level through 19:00, providing a gentle end to the day's UV journey. Remember to take precautions during the peak hours for safe sun enjoyment!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 2 | low | 45 min |
| 08:00 | 3 | moderate | 30 min |
| 09:00 | 6 | high | 25 min |
| 10:00 | 9 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 8 | very high | 15 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 2 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index shows significant seasonal changes, peaking during the summer months. From January to February, the UV levels rise from moderate (5) to high (7), with burn times decreasing from 30 minutes to 25 minutes. The following months, March through September, present the highest risks, with the UV Index reaching its maximum in June and July at 13, falling within the extreme category where burn times drop to just 10 minutes. After this peak, the index gradually decreases to 8 in October (very high) and continues to decline to 6 in November and 5 in December (both moderate). Visitors and residents are therefore advised to take extra precautions during the high-risk months of March through September, utilizing sunscreen, protective clothing, and seeking shade to mitigate UV exposure.
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 |
| Saint Johns | 5 | 7 | 10 | 12 | 12 | 13 | 13 | 12 | 11 | 8 | 6 | 5 |