Last updated: July 2, 2025
Awareness of the UV Index is crucial for residents of Siraha, Nepal, as it serves as a vital tool in protecting skin health from harmful ultraviolet rays. Understanding UV levels is essential for sunburn prevention, particularly given the significant peaks in exposure during the day. Siraha’s Cwa climate brings warm summers and mild winters, which can elevate UV risks, especially from late morning to early afternoon when the index reaches its highest levels of 12-13. Stay informed and take proactive measures to safeguard your skin and enjoy the sunny days responsibly!
As the day unfolds, the UV Index follows a dynamic trajectory, peaking around midday. Starting from a low of 3 at 07:00, the intensity escalates sharply, reaching 6 by 08:00. The sun's rays become increasingly potent, surging to a striking 12 at 10:00 and hitting a maximum of 13 between 11:00 and 12:00. After this zenith, the index begins its graceful descent, dipping to 11 by 13:00, then dropping further to 7 at 14:00. By mid-afternoon, the intensity wanes significantly, landing at 4 by 15:00 and continuing to decline to 1 by 17:00. As the sun sets, the UV Index finally settles at 0 by 18:00, indicating a gentle end to the day’s solar intensity. Be sure to take precautions during peak hours to safeguard your skin!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 3 | moderate | 30 min |
| 08:00 | 6 | high | 25 min |
| 09:00 | 9 | very high | 15 min |
| 10:00 | 12 | extreme | 10 min |
| 11:00 | 13 | extreme | 10 min |
| 12:00 | 13 | extreme | 10 min |
| 13:00 | 11 | extreme | 10 min |
| 14:00 | 7 | high | 25 min |
| 15:00 | 4 | moderate | 30 min |
| 16:00 | 2 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, the UV Index displays significant seasonal variations, with high-risk months primarily occurring from March to September. During these months, the UV Index reaches levels classified as very high to extreme, with peak values of 13 in July and 12 from June to September. Consequently, during these times, the recommended burn time drastically decreases, ranging from 10 minutes in the most intense periods to 15 minutes in late autumn. Visitors and residents are advised to take necessary precautions, such as wearing sunscreen, protective clothing, and wide-brimmed hats, particularly during midday hours when UV radiation is strongest. Awareness and proactive measures can help prevent skin damage and associated health risks throughout the year.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Biratnagar UVI | 5 | 6 | 8 | 9 | 10 | 11 | 13 | 12 | 12 | 9 | 7 | 5 |
| Birganj UVI | 5 | 6 | 8 | 10 | 10 | 12 | 13 | 12 | 11 | 9 | 7 | 5 |
| Siraha | 5 | 6 | 8 | 10 | 10 | 12 | 13 | 12 | 12 | 9 | 7 | 5 |
| Patan UVI | 5 | 7 | 9 | 11 | 11 | 13 | 14 | 13 | 12 | 10 | 7 | 5 |
| Kathmandu UVI | 5 | 7 | 9 | 11 | 11 | 13 | 14 | 13 | 12 | 10 | 7 | 5 |
| Pokhara UVI | 7 | 9 | 12 | 13 | 14 | 15 | 15 | 15 | 14 | 12 | 8 | 6 |