Last updated: August 1, 2025
Understanding the UV Index is crucial for residents of Lewistown, United States, as it provides vital information about sun exposure risks that can impact skin health. With UV levels peaking at a potentially harmful 10 during midday, being informed can help you take preventive measures against sunburn and long-term skin damage. Given Lewistown's Dfa climate, characterized by warm summers, it’s essential to stay aware of daily UV fluctuations to protect yourself and your loved ones from the sun’s harmful rays. Stay proactive and keep your skin safe while enjoying the beautiful outdoors!
Today's UV Index presents an intriguing curve, starting the day with a mellow maximum of 1 at 07:00. As the sun climbs higher, things heat up quickly—by 10:00, the index reaches 6, and by 12:00, it peaks at an intense 10. This level remains steady until 14:00, urging sun enthusiasts to take precautions. As the afternoon fades, the UV Index gracefully tapers off, dropping to 4 by 17:00, and finally sinking back to a gentle 1 by 19:00. With mid-day UV levels soaring, it’s crucial to stay protected during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 9 | very high | 15 min |
| 13:00 | 9 | very high | 15 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 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
During the year, UV levels exhibit significant seasonal changes, with March to September being the high-risk months where exposure becomes a notable concern. Starting from March, the UV Index rises sharply, peaking at 11 in June, categorized as extreme with a burn time of just 10 minutes. April and May also present very high risks with a UV Index of 9 and 10, respectively. As the summer progresses, July and August continue with a UV Index of 10, gradually declining to 8 in September. October marks a transition back to elevated, but more manageable, levels, tapering off to moderate exposure in winter months (November and December) with indices at 4 and 3. Residents and visitors should take precautions from March through September by applying sunscreen, wearing protective clothing, and seeking shade during peak sunlight hours to minimize the risk of UV-related health issues.
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 |
| Lewistown | 3 | 5 | 7 | 9 | 10 | 11 | 10 | 10 | 8 | 6 | 4 | 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 |