Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Rantau Prapat, Indonesia, where the tropical climate amplifies the sun's intensity. With UV levels peaking at 12 during midday hours, awareness of these fluctuations is key to preventing sunburn and safeguarding skin health. As the sun reaches its highest point, the risk of harmful UV exposure increases significantly, making it essential for locals and visitors alike to stay informed. By monitoring the UV Index, you can better protect yourself from the sun's harmful rays and enjoy the beautiful weather that Rantau Prapat has to offer, while ensuring your skin remains healthy and radiant.
The UV Index throughout the day presents a clear illustration of rising intensity, peaking sharply at 12 around noon. Starting from a gentle 1 at 07:00, the index escalates as the sun climbs higher in the sky, reaching 11 at 11:00 and holding steady at 12 until 13:00. As the afternoon progresses, a gradual decline follows; the UV Index dips to 10 by 14:00, then further decreases to 7 at 15:00. By late afternoon, the intensity drops to 3 at 16:00, and eventually settles back down to 1 by 17:00 and beyond, with the index closing out the day at 0 after 19:00. This data underscores the importance of sun protection during those peak hours to stay safe under the sun!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 4 | moderate | 30 min |
| 10:00 | 8 | very high | 15 min |
| 11:00 | 11 | extreme | 10 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 12 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 3 | moderate | 30 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 1 | low | 45 min |
| 19:00 | 0 | low | 45 min |
Throughout the year, there are significant seasonal changes in UV exposure, with the highest UV indices occurring from March to September. During these months, particularly March (15), April (15), and September (15), the UV Index reaches its peak, categorized as extreme, and a mere 10 minutes of sun exposure can lead to skin burns. Residents and visitors should be particularly cautious during these high-risk months and take protective measures, such as wearing sunscreen, protective clothing, and sunglasses, while seeking shade during peak sunlight hours. Even in the cooler months, such as January and February, where the UV Index remains high at 13-14, individuals should not become complacent and should continue to prioritize sun safety year-round.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Surabaya UVI | 13 | 15 | 14 | 12 | 12 | 10 | 11 | 12 | 14 | 13 | 13 | 13 |
| Bekasi UVI | 14 | 16 | 16 | 14 | 11 | 10 | 10 | 11 | 13 | 15 | 14 | 13 |
| Jakarta UVI | 14 | 16 | 16 | 14 | 11 | 10 | 10 | 11 | 13 | 15 | 14 | 13 |
| Medan UVI | 13 | 15 | 15 | 15 | 14 | 12 | 12 | 13 | 14 | 14 | 13 | 12 |
| Rantau Prapat | 13 | 14 | 15 | 15 | 14 | 12 | 12 | 14 | 15 | 14 | 13 | 12 |
| Bandung UVI | 15 | 16 | 16 | 15 | 12 | 11 | 11 | 12 | 14 | 15 | 15 | 14 |