On this page, you can find the current UV Index and hourly 5 day UV Index forecast for Marietta-Alderwood, Whatcom County, Washington (WA). The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated daily.
(Updated 55 minutes ago.)
As of 8:55 PM
PDT, the UV Index in Marietta-Alderwood, WA is 0 (Low).
The UV Index is expected to rise to 0.2 between 8:00 AM - 9:00 AM
PDT
tomorrow.
UV Index Data sourced from the NOAA.
As of 8:55 PM PDT on Monday, September 22, 2025, the UV index in Marietta-Alderwood, WA is at a low level of 0. At this time of the night, the sun has already set and there is no exposure to UV radiation. The UV Index will remain at 0 through the early morning hours until around 8:00 AM tomorrow.
As the day progresses tomorrow (September 23, 2025), the UV Index will rise to 0.2 between 8:00 AM - 9:00 AM, still considered low. The UV Index in Marietta-Alderwood will continue to rise through the morning, reaching a moderate level of 3 between 11:00 AM - 12:00 PM. The UV Index will peak between 1:00 PM and 2:00 PM with a moderate reading of 4.6.
For the protection of your health against UV exposure, we highly recommended wearing sunglasses, generously applying broad-spectrum SPF 15+ strength sunscreen on exposed skin, covering the body with sun-protective clothing and a wide-brim hat, and reducing the time spent outdoors in the sun during peak hours.
After reaching its peak for the day, the UV Index will gradually decline through the afternoon and evening. It will return to moderate levels at 2:00 PM and then drop to low levels again from 4:00 PM onwards. As the day transitions into the night, the UV Index will drop back down to 0 at 7:00 PM.
| Time Range | UV Index | Risk |
|---|---|---|
| 6:00 AM - 11:00 AM (PDT) | 0 - 1.8 | Low |
| 11:00 AM - 4:00 PM | 3.2 - 4.6 | Moderate |
| 4:00 PM - 12:00 AM | 0 - 2.2 | Low |
| Time Range | UV Index | Risk |
|---|---|---|
| 12:00 AM - 11:00 AM (PDT) | 0 - 1.7 | Low |
| 11:00 AM - 4:00 PM | 3 - 4.6 | Moderate |
| 4:00 PM - 12:00 AM | 0 - 2.2 | Low |
| Time | UV Index | Risk |
|---|---|---|
| 8:00 PM - 9:00 PM (Now, PDT) | 0 | Low |
| 9:00 PM - 10:00 PM | 0 | Low |
| 10:00 PM - 11:00 PM | 0 | Low |
| 11:00 PM - 12:00 AM | 0 | Low |