Lake Marcel-Stillwater, WA: Current UV Index and Hourly Forecast

On this page, you can find the current UV Index and hourly 5 day UV Index forecast for Lake Marcel-Stillwater, King County, Washington (WA). The Ultraviolet Index forecast, which measures the radiation from the sun that reaches the Earth's surface is updated daily.

Current UV Index
5:38 PM PDT

1Risk: Low

(Updated 38 minutes ago.)

As of 5:38 PM PDT, the UV Index in Lake Marcel-Stillwater, WA is 1 (Low).
The UV Index is expected to fall to 0.3 (still Low) between 6:00 PM - 7:00 PM PDT today.

Hourly UV Index Forecast for Today
Sunday, September 20, 2026

6 AM9 AM12 PM3 PM6 PM9 PMPacific Daylight Time (PDT)0123456789101112Current Time: 5:38 PM, PDT

UV Index Data sourced from the NOAA.


As of 5:38 PM PDT today in Lake Marcel-Stillwater, WA, the UV Index is currently at a low level of 1. As the day progresses, the UV index is expected to fall as the sun sets.

The UV Index will return to low levels of 0.3 at 6:00 PM. As the day transitions into the night, the UV Index will drop back down to 0 at 7:00 PM.


Summary of Hourly UV Index Forecast for Today and Tomorrow in Lake Marcel-Stillwater, WA

Today

Time RangeUV IndexRisk
6:00 AM - 11:00 AM (PDT)0 - 1.7
Low
11:00 AM - 4:00 PM3.1 - 4.7
Moderate
4:00 PM - 12:00 AM0 - 2.2
Low

Tomorrow

Time RangeUV IndexRisk
12:00 AM - 11:00 AM (PDT)0 - 1.8
Low
11:00 AM - 4:00 PM2.8 - 3.8
Moderate
4:00 PM - 12:00 AM0 - 1.9
Low

Detailed Hourly Lake Marcel-Stillwater UV Index Forecast for the next 5 days

Download CSV (Excel) ↓
TimeUV IndexRisk
5:00 PM - 6:00 PM (Now, PDT)1
Low
6:00 PM - 7:00 PM 0.3
Low
7:00 PM - 8:00 PM 0
Low
8:00 PM - 9:00 PM 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

Current UV Index in Nearby Cities