Last updated: June 2, 2025
Understanding the UV Index in Arusha, Tanzania is crucial for protecting your skin and overall health. High levels of ultraviolet radiation, especially during the midday hours, can lead to sunburn and increase the risk of skin cancer. With Arusha's unique climate—characterized by a highland atmosphere—UV exposure fluctuates significantly throughout the day. For instance, the UV Index peaks at 12 around noon, indicating an extreme risk of harm from unprotected sun exposure. Staying informed about UV levels not only helps in prevention but also fosters a culture of awareness about skin health in this vibrant city.
As the day unfolds, the UV Index rises dramatically, peaking at 12 around noon, indicating a high level of solar intensity. Morning hours start off gentle, with a gradual increase from 1 at 07:00 to 4 by 09:00. By 10:00, the index surges to 7, and as we approach 11:00, it skyrockets to its zenith of 10. The intensity remains fierce until 13:00, where it slightly dips to 11 before heading downwards. The afternoon offers some respite, as the UV Index drops to 10 at 14:00 and then gently declines to 3 by 16:00. Finally, as the sun sets, the index plummets to 1 by 17:00 and ultimately fades to 0 by 19:00, marking the end of a day filled with sun exposure potential. To stay safe, remember to shield yourself during the peak hours!
| 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 | 7 | high | 25 min |
| 11:00 | 10 | very high | 15 min |
| 12:00 | 12 | extreme | 10 min |
| 13:00 | 11 | 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, the UV Index consistently remains at extreme levels, highlighting a significant risk for sunburn. January to April sees the highest UV Index readings, ranging from 15 to 16, indicating that residents and visitors should take extra precautions when exposed to sunlight, as burn time is as little as 10 minutes. The risk remains high in May and June with values of 14 and 12, respectively, before slightly decreasing through the summer months of July and August. September to November returns to UV Index levels around 13 to 14, and finally, December sees a slight drop to 14, yet maintains the extreme exposure category. It is crucial for everyone to apply sunscreen, wear protective clothing, and limit sun exposure during all months, especially from January through April when the risk is paramount.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Zanzibar UVI | 14 | 14 | 14 | 14 | 12 | 10 | 10 | 12 | 13 | 13 | 13 | 13 |
| Dar es Salaam UVI | 14 | 14 | 15 | 14 | 12 | 10 | 10 | 12 | 13 | 13 | 13 | 13 |
| Mwanza UVI | 14 | 15 | 16 | 15 | 13 | 11 | 11 | 13 | 14 | 13 | 13 | 13 |
| Arusha | 15 | 16 | 16 | 16 | 14 | 12 | 12 | 13 | 14 | 14 | 13 | 14 |
| Mbeya UVI | 16 | 16 | 16 | 16 | 13 | 11 | 11 | 13 | 14 | 14 | 14 | 15 |