Last updated: July 2, 2025
Understanding the UV Index is crucial for residents of Grenfell, Australia, especially given the region's Cfa climate that often brings sunny days and higher UV exposure. Being aware of UV levels not only helps prevent painful sunburns but also plays a significant role in maintaining long-term skin health. During peak hours, particularly between 12 PM and 2 PM, the UV Index can reach a notable level of 4, indicating a moderate risk of harm from unprotected sun exposure. By staying informed about daily UV ratings, Grenfell residents can enjoy the outdoors safely while protecting themselves from the potential dangers of UV radiation.
The UV Index throughout the day showcases a gradual rise and fall, reflecting the sun's journey across the sky. Starting at 07:00, the index registers a low 1, signifying minimal risk. As the day progresses, by 09:00 it ticks up to 2, and reaches its peak 4 at 12:00 and 13:00, indicating a moderate risk of harm from unprotected sun exposure. As the afternoon wanes, the index dips back to 3 by 14:00 and gently descends to 1 by 16:00, before falling to 0 after 18:00, suggesting it’s safe for evening activities. This pattern reminds us to safeguard our skin during those peak hours when UV rays can be most intense!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 1 | low | 45 min |
| 09:00 | 2 | low | 45 min |
| 10:00 | 3 | moderate | 30 min |
| 11:00 | 3 | moderate | 30 min |
| 12:00 | 4 | moderate | 30 min |
| 13:00 | 4 | moderate | 30 min |
| 14:00 | 3 | moderate | 30 min |
| 15:00 | 2 | low | 45 min |
| 16:00 | 1 | low | 45 min |
| 17:00 | 1 | low | 45 min |
| 18:00 | 0 | low | 45 min |
| 19:00 | 0 | low | 45 min |
The UV Index experiences significant seasonal variation, with high-risk months predominantly occurring from January to March and November to December, all falling into the extreme exposure category with a burn time of just 10 minutes. In these months, visitors and residents should take extra precautions, such as seeking shade and wearing protective clothing, when outdoors. As we move into April and September to October, the UV levels remain very high, advising a burn time of 15 minutes. May through July sees a dip in UV levels to moderate, with burn times of 30 minutes, providing a relative reprieve before the UV Index begins to rise again in August at a high exposure level of 6. To ensure safety, it's crucial to stay informed about current UV conditions throughout the year and take appropriate protective measures during high-risk periods.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Melbourne UVI | 14 | 12 | 11 | 7 | 4 | 3 | 3 | 5 | 7 | 9 | 12 | 14 |
| Adelaide UVI | 14 | 13 | 12 | 8 | 5 | 3 | 4 | 5 | 7 | 10 | 12 | 15 |
| Sydney UVI | 14 | 13 | 11 | 8 | 5 | 3 | 4 | 6 | 8 | 10 | 12 | 14 |
| Perth UVI | 14 | 14 | 11 | 9 | 6 | 4 | 4 | 6 | 8 | 11 | 13 | 14 |
| Grenfell | 15 | 14 | 12 | 8 | 5 | 3 | 4 | 6 | 8 | 10 | 13 | 15 |
| Brisbane UVI | 15 | 15 | 13 | 10 | 7 | 5 | 5 | 8 | 9 | 12 | 14 | 15 |