Last updated: May 3, 2025
Understanding the UV Index in Grand Junction is crucial for safeguarding your skin and overall health amidst the region's sunny climate. As the sun's rays can be particularly intense—especially during peak hours—knowledge of UV levels helps you take proactive measures against sunburn and long-term skin damage. With a climate characterized by hot summers and abundant sunshine, residents and visitors alike should be aware that UV Index values can reach as high as 9 during midday, heightening the risk of harmful exposure. Stay informed, stay protected, and enjoy the great outdoors safely!
As the day dawns, the UV Index slowly rises from a gentle 1 at 7:00 AM, urging early risers to tread carefully under the sun. By 10:00 AM, it climbs to a moderate 5, hinting at the need for sunscreen. The peak intensity hits at 12:00 PM, with a striking 9 that lasts until 2:00 PM—a clear signal for everyone to seek shade and protect their skin. As the afternoon progresses, a gradual decline sees the index fall back to 7 by 3:00 PM, and down to 3 by the evening. The sun’s formidable grip weakens, allowing for a more comfortable experience as it sets, leaving a 2 at 6:00 PM and winding down to 1 by 7:00 PM. Throughout the day, awareness of UV levels can ensure a safe and enjoyable outdoor experience!
| 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 | 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 | 6 | high | 25 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant seasonal fluctuations, with the highest levels occurring during the summer months. March and April see an uptick as the UV Index rises from 5 to 8, marking the beginning of high-risk periods. May through August represent the peak risk months, where UV Index values reach extremely high levels (up to 11 in June), necessitating strong sun protection measures. Visitors and residents are advised to limit sun exposure, especially between 10 AM and 4 PM, when UV radiation is at its strongest. During these high-risk months, protective clothing, sunscreen, and seeking shade are essential precautions to prevent sunburn and long-term skin damage. As autumn arrives in September, the UV Index begins to gradually decline, but caution is still advisable, particularly in October with a still moderately high index of 6.
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 |
| Grand Junction | 3 | 5 | 5 | 8 | 9 | 11 | 10 | 9 | 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 |