Last updated: May 3, 2025
In Chehalis, United States, awareness of the UV Index is essential for protecting your skin and overall health. Understanding UV levels can significantly reduce the risk of sunburn and long-term skin damage, especially during those peak exposure times when the index hits a maximum of 9 around midday. Situated in a cool-summer Mediterranean climate (Csb), Chehalis experiences unique UV exposure risks, with varying levels throughout the day. Staying informed about UV conditions helps residents take the necessary precautions to enjoy the outdoors safely while savoring the beautiful Pacific Northwest surroundings.
As the sun rises, the UV Index begins its gradual ascent. At 7:00 AM, it starts at a modest 1, indicating minimal risk. By 8:00 AM, it rises to 2, still manageable for early risers. The intensity picks up at 9:00 AM with a 3, signaling the need for a little sunscreen. The peak arrives between 11:00 AM and 1:00 PM, where it soars to a striking 9 at 1:00 PM, which suggests strong sun protection is essential. Following this, the index slips down, recorded at 8 at 2:00 PM and 7 at 3:00 PM, offering a brief reprieve. As the afternoon fades into evening, the UV Index drops steadily, landing back at 1 by 7:00 PM. Stay informed and protect your skin during those peak hours!
| Time | UVI | Category | Time to Burn |
|---|---|---|---|
| 07:00 | 1 | low | 45 min |
| 08:00 | 2 | low | 45 min |
| 09:00 | 3 | moderate | 30 min |
| 10:00 | 5 | moderate | 30 min |
| 11:00 | 7 | high | 25 min |
| 12:00 | 8 | very high | 15 min |
| 13:00 | 9 | very high | 15 min |
| 14:00 | 8 | very high | 15 min |
| 15:00 | 7 | high | 25 min |
| 16:00 | 5 | moderate | 30 min |
| 17:00 | 3 | moderate | 30 min |
| 18:00 | 2 | low | 45 min |
| 19:00 | 1 | low | 45 min |
Throughout the year, the UV Index varies significantly, highlighting important seasonal changes that affect both residents and visitors. January and December see the lowest UV levels (Index 2, low exposure), with a generous burn time of 45 minutes, making them relatively safer months. As the year progresses into spring, February (Index 3, moderate) and March (Index 5, moderate) indicate a gradual increase in UV exposure, requiring more cautious sun protection. Attention is crucial during the peak summer months of May, June, and July, where the UV Index reaches 9, categorizing them as very high, with burn times dropping to just 15 minutes. August and September also pose high risks (Indexes 8 and 7, respectively), making sun safety paramount. As autumn approaches, conditions moderate again in October and November, reverting to a moderate index, but precautions should still be taken. Those engaging in outdoor activities should be vigilant with sun protection, especially between May and September, to mitigate the risk of skin damage.
UV Risk Categories
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Chehalis | 2 | 3 | 5 | 6 | 9 | 9 | 9 | 8 | 7 | 5 | 3 | 2 |
| Chicago UVI | 3 | 4 | 6 | 8 | 9 | 10 | 10 | 9 | 8 | 6 | 4 | 2 |
| Brooklyn UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| New York City UVI | 3 | 5 | 6 | 8 | 10 | 10 | 9 | 9 | 8 | 6 | 4 | 2 |
| Los Angeles UVI | 4 | 6 | 8 | 9 | 10 | 11 | 11 | 10 | 10 | 7 | 5 | 4 |
| Houston UVI | 5 | 8 | 9 | 11 | 11 | 12 | 12 | 11 | 10 | 9 | 7 | 5 |