Last updated: June 2, 2025
Understanding the UV Index in Port Arthur, United States is essential for residents and visitors alike, as it provides a crucial gauge of ultraviolet (UV) radiation levels throughout the day. Awareness of UV levels is vital for preventing sunburn, promoting skin health, and reducing the risk of skin-related issues in the long run. With Port Arthur's humid subtropical climate, inhabitants face unique UV exposure risks, especially during the peak hours of midday when the UV Index can soar to 11 or even 12. Stay informed and protect your skin from harmful rays to enjoy the beautiful sunshine that Port Arthur has to offer!
As the sun rises, the UV Index starts at a low 1 at 07:00, offering a safe environment for early risers. By 08:00, it edges up to 2, still remaining relatively mild. However, the tide begins to turn at 09:00 as it climbs to 3, marking the onset of more significant UV radiation. From 10:00 onward, the index surges dramatically, peaking at an intense 12 between 13:00 and 14:00—a critical window where sun protection becomes essential. After reaching its zenith, the UV levels begin a gradual decline, dropping to 10 at 15:00, and continuing to fall to just 1 by 19:00. This hourly data underscores the importance of vigilance during the midday hours when UV exposure is at its highest.
| 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 | 9 | very high | 15 min |
| 12:00 | 11 | 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 |
As the seasons change, so do the UV Index levels, significantly affecting the risk of skin damage from sun exposure. January and December have a moderate UV Index of 5, allowing for a burn time of 30 minutes. However, by February, the UV levels escalate to 8, marking the beginning of very high exposure with a reduced burn time of 15 minutes. The risk peaks in the summer months, particularly April through August, where the UV Index reaches a maximum of 12, classified as extreme, necessitating protective measures within just 10 minutes. September and October see a slight decline to very high levels of 10 and 9, respectively, while November cools to a high risk of 7 with a burn time of 25 minutes. Visitors and residents are advised to take precautions during the high-risk months of February to August, utilizing sunscreen, protective clothing, and seeking shade, particularly during peak sun hours, to minimize sun damage and maintain skin health.
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 |
| Port Arthur | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |