Last updated: October 4, 2025
Understanding the UV Index is crucial for residents of Primero de Mayo, Argentina, as it plays a significant role in maintaining skin health and preventing sunburn. Given the region's BWk climate, which features distinct dry and warm seasons, being aware of daily UV exposure can help you protect yourself and your loved ones from harmful rays, especially when levels peak during midday hours. With maximum UV Index values reaching up to 5 around 2 PM, it's essential to stay informed and take appropriate precautions to enjoy the sun safely while minimizing the risk of skin damage.
The UV Index data reveals an intriguing fluctuation throughout the day. Early morning hours from 07:00 to 09:00 see the UV Index lingering at a comfortable 0-1, indicating minimal risk. As the day progresses, a gentle rise occurs, peaking at 12:00 and 13:00, where the index reaches a moderate 4-5—a reminder to seek shade and wear protection. The afternoon sun then begins to mellow, as the UV levels dip back to 3 by 16:00 and continue to ease into the evening, eventually returning to 0 by 19:00. This data highlights the importance of staying vigilant during peak hours, especially between 11:00 and 15:00 when protection is most crucial.
| 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 | 8 | very high | 15 min |
| 12:00 | 11 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 11 | extreme | 10 min |
| 15:00 | 9 | very high | 15 min |
| 16:00 | 6 | high | 25 min |
| 17:00 | 4 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
The UV Index experiences significant fluctuations throughout the year, with the highest risk months occurring from January to March and October to November, where it reaches extreme levels of 14 to 15, and a burn time of just 10 minutes. Spring sees a decrease in risk, with April and May transitioning to very high and high categories, allowing slightly longer burn times of 15 to 25 minutes. The summer months of June and July offer moderate exposure with a UV Index of 4 to 5 and burn times up to 30 minutes. As autumn arrives in September, UV levels rise again to very high, returning to cautionary levels by October. It is crucial for visitors and residents to take protective measures during peak UV months, such as wearing sunscreen, protective clothing, and seeking shade, especially during the extreme exposure periods when burn times are significantly shorter.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Buenos Aires UVI | 14 | 13 | 11 | 7 | 5 | 4 | 4 | 6 | 8 | 10 | 13 | 14 |
| Rosario UVI | 14 | 13 | 11 | 8 | 5 | 4 | 4 | 6 | 8 | 11 | 13 | 14 |
| Mendoza UVI | 15 | 14 | 12 | 8 | 6 | 4 | 5 | 6 | 9 | 12 | 14 | 15 |
| Primero de Mayo | 15 | 14 | 12 | 9 | 6 | 4 | 5 | 6 | 9 | 12 | 14 | 15 |
| Cordoba UVI | 15 | 13 | 12 | 9 | 6 | 4 | 5 | 7 | 9 | 12 | 14 | 15 |
| San Miguel de Tucuman UVI | 15 | 14 | 13 | 10 | 7 | 5 | 6 | 7 | 10 | 13 | 15 | 15 |