Last updated: May 3, 2025
Understanding the UV Index is crucial for residents and visitors of Astambul, Indonesia, where the tropical climate brings high levels of sunlight throughout the year. With UV levels peaking at a staggering 14 during midday, it's essential to be aware of potential risks such as sunburn and long-term skin damage. By keeping an eye on the UV Index, you can make informed decisions about sun safety, ensuring you enjoy the beautiful weather without compromising your skin health. Whether you’re lounging on the beach or exploring the vibrant landscape, staying informed about UV exposure risks can help you protect yourself from harmful effects of the sun.
The UV Index throughout the day follows a striking pattern, peaking sharply during the midday hours. Starting early, at 07:00, it begins at a modest 1, slowly climbing to 2 by 08:00. As the sun rises higher, the index reaches a significant 9 by 10:00 and escalates to a glaring 14 at 12:00, marking the height of solar intensity. Interestingly, this midday zenith of 12:00 draws a slight decline by 14:00, settling at 10. From there, a gentle descent occurs, with values dropping to 6 by 15:00 and further down to 3 at 16:00. The evening hours see a return to low levels, closing out the day with 1 at 17:00 and fading to 0 by 19:00. This data highlights the critical need for sun protection during the peak hours when UV radiation is the strongest.
| 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 | 9 | very high | 15 min |
| 11:00 | 12 | extreme | 10 min |
| 12:00 | 14 | extreme | 10 min |
| 13:00 | 13 | extreme | 10 min |
| 14:00 | 10 | very high | 15 min |
| 15:00 | 6 | 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, the UV Index remains consistently high, peaking at 16 in March and slowly decreasing to 14 in May and 14 in November and December. January, February, March, and April are particularly notable for having extreme UV levels, with all months reporting a UV Index of 14 or higher, indicating a high-risk period for sun exposure. Residents and visitors should remain vigilant, especially during these months, and take necessary precautions such as using sunscreen, wearing protective clothing, and limiting sun exposure to avoid skin damage. Even in the summer months of June, July, and August, the UV Index remains dangerously high (between 11 and 13), emphasizing the importance of sun safety year-round. Remember, the burn time is consistently 10 minutes across all months, underscoring the need for swift action to protect skin from harmful UV radiation.
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 |
| Bandung UVI | 15 | 16 | 16 | 15 | 12 | 11 | 11 | 12 | 14 | 15 | 15 | 14 |
| Astambul | 14 | 15 | 16 | 15 | 14 | 11 | 12 | 13 | 14 | 15 | 14 | 14 |