Last updated: June 2, 2025
Understanding the UV Index is crucial for residents of Osku, Iran, where the climate typically presents a blend of dry summers and cool winters, resulting in varied UV exposure throughout the year. Being aware of the UV levels not only helps in preventing sunburn but also plays a significant role in maintaining long-term skin health. With peak UV Index values reaching as high as 12 during midday, it’s essential for locals to take precautions, especially on sunny days. By staying informed about the UV Index, you can take the necessary steps to protect your skin and enjoy the great outdoors safely!
As the sun rises, the UV Index begins its ascent, starting at a mild 1 at 07:00 and gradually climbing throughout the morning. By 09:00, it reaches a moderate 5, signaling the need for some sun protection. The intensity peaks around 12:00, with a high of 12, which indicates very high levels of UV radiation. Hereafter, the index gently declines, tapering off to 9 by 15:00, before easing down to 4 by 17:00. As the evening unfolds, the UV risk diminishes, dropping to 2 by 18:00 and finally returning to 1 at 19:00. This hourly UVI data underscores the importance of being mindful of sun exposure, especially during the midday hours when UV levels are at their highest.
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 5 | moderate | 30 min |
| 10:00 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | 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 |
Throughout the year, the UV Index demonstrates significant seasonal variation, with peak levels occurring in the summer months. From March to September, the UV Index frequently escalates to very high and extreme categories, particularly in May, June, and July, when the index reaches a peak of 12. The months of March and April also see heightened UV levels of 9, indicating a shift towards more dangerous exposure. Visitors and residents should be particularly cautious during these high-risk months—from March to August—where even short sun exposure can lead to skin damage. It is advisable to apply sunscreen frequently, wear protective clothing, and seek shade during peak sun hours, particularly when the UV Index is high. In contrast, winter months (January, February, November, and December) exhibit moderate UV levels, with a maximum burn time of 30 minutes.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Karaj UVI | 4 | 5 | 8 | 9 | 12 | 12 | 11 | 10 | 10 | 7 | 4 | 3 |
| Mashhad UVI | 4 | 5 | 8 | 10 | 12 | 12 | 12 | 11 | 10 | 7 | 4 | 3 |
| Tehran UVI | 4 | 6 | 8 | 9 | 13 | 12 | 11 | 10 | 10 | 7 | 5 | 3 |
| Osku | 4 | 5 | 9 | 9 | 12 | 12 | 12 | 11 | 9 | 7 | 4 | 3 |
| Tabriz UVI | 4 | 5 | 9 | 10 | 12 | 12 | 12 | 11 | 9 | 7 | 4 | 3 |
| Isfahan UVI | 5 | 7 | 10 | 10 | 13 | 13 | 12 | 11 | 10 | 9 | 6 | 4 |