Last updated: July 2, 2025
In Tres Arroyos, Argentina, being aware of the UV Index is crucial for safeguarding your skin health. With its Cfb climate, the region experiences varied exposure to UV radiation, which peaks during the warmer hours of the day. Understanding these UV levels is essential, as even brief sun exposure can lead to sunburns and long-term skin damage. With the highest UV Index reaching 3 around midday, staying informed can help you take proactive measures against harmful effects while enjoying the beautiful Argentine sunshine.
The UV Index throughout the day exhibits a notable progression, starting from a comfortable 0 at 07:00 and 08:00, indicating minimal sun exposure risk. As the day unfolds, the index gently rises to 1 by 09:00 and stays steady at 1 until 10:00. A surge occurs around midday, with the UV Index reaching a moderate 2 at 11:00 and peaking at 3 from 12:00 to 14:00, signaling a heightened need for sun protection. In the afternoon, the index gradually declines, dropping back to 2 by 15:00 and tapering down to 1 by 16:00, before returning to a safe 0 by 18:00, then remaining at 0 into the evening. This daily UV pattern highlights the importance of being sun-smart during peak hours.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 0 | low | 45 min |
| 08:00 | 0 | low | 45 min |
| 09:00 | 1 | low | 45 min |
| 10:00 | 1 | low | 45 min |
| 11:00 | 2 | low | 45 min |
| 12:00 | 3 | moderate | 30 min |
| 13:00 | 3 | moderate | 30 min |
| 14:00 | 3 | moderate | 30 min |
| 15:00 | 2 | low | 45 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index experiences significant seasonal fluctuations, with January and December leading as the months with the highest risk, both at UV Index 14 in the extreme exposure category, where you can burn in just 10 minutes. Notably, February and November also pose a high risk with UV Index 12. As spring approaches, March sees a reduction to UV Index 10 (very high), while April drops to UV Index 7 (high), allowing for longer safe exposure times of 25 minutes. The summer months of May, June, and July present moderate risks (UV Index 4 to 3) with burn times extending to 30 minutes. However, this risk rises again in September and October before returning to extreme levels in late fall and winter. Visitors and residents should take precautions, especially during the high-risk months of January, February, October, and November, by wearing protective clothing, applying sunscreen, and seeking shade during peak sun hours to ensure skin safety.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Tres Arroyos | 14 | 12 | 10 | 7 | 4 | 3 | 3 | 5 | 7 | 10 | 12 | 14 |
| 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 |
| 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 |