UV Index for Mercer Island, WA

Current Mercer Island UV Index

0.1 (Low)

Last Updated 24 minutes ago

Hourly Mercer Island UV Index

The hourly Mercer Island, WA UV Index forecast for Thursday, December 4th, 2025.

5 Day Hourly Mercer Island UV Index Forecast

Last Updated 3 hours ago

The UV index forecast for the next five days in Mercer Island, WA has no days reaching the extreme level and no days reaching the high or very high levels. The peak UV intensity in Mercer Island over the next five days will be 0.8 on Saturday, December 6th at 1:00 pm.

The UV index forecast for Thursday, December 4th in Mercer Island, WA is below.

Time UV Index Risk
2pm 0
Low
3pm 0
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Friday, December 5th in Mercer Island, WA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0
Low
9am 0
Low
10am 0.1
Low
11am 0.4
Low
12pm 0.4
Low
1pm 0.5
Low
2pm 0.2
Low
3pm 0.2
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Saturday, December 6th in Mercer Island, WA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0
Low
9am 0.2
Low
10am 0.4
Low
11am 0.7
Low
12pm 0.7
Low
1pm 0.8
Low
2pm 0.6
Low
3pm 0
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, December 7th in Mercer Island, WA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low
5am 0
Low
6am 0
Low
7am 0
Low
8am 0
Low
9am 0
Low
10am 0
Low
11am 0
Low
12pm 0.1
Low
1pm 0.1
Low
2pm 0
Low
3pm 0
Low
4pm 0
Low
5pm 0
Low
6pm 0
Low
7pm 0
Low
8pm 0
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, December 8th in Mercer Island, WA is below.

Time UV Index Risk
12am 0
Low
1am 0
Low
2am 0
Low
3am 0
Low
4am 0
Low