UV Index for Mercer Island, WA

Current Mercer Island UV Index

4.2 (Moderate)

Last Updated 25 minutes ago

Hourly Mercer Island UV Index

The hourly Mercer Island, WA UV Index forecast for Saturday, July 5th, 2025.

5 Day Hourly Mercer Island UV Index Forecast

Last Updated 23 hours ago

The UV index forecast for the next five days in Mercer Island, WA has no days reaching the extreme level and 3 days reaching the high or very high levels. The peak UV intensity in Mercer Island over the next five days will be 8.3 on Monday, July 7th at 1:00 pm.

The UV index forecast for Saturday, July 5th in Mercer Island, WA is below.

Time UV Index Risk
11am 6
High
12pm 7.4
High
1pm 8
Very High
2pm 7.6
High
3pm 6
High
4pm 4.5
Moderate
5pm 2.9
Low
6pm 1.6
Low
7pm 0.6
Low
8pm 0.2
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Sunday, July 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 0.1
Low
7am 0.4
Low
8am 1.2
Low
9am 2.6
Low
10am 4.3
Moderate
11am 6.1
High
12pm 7.4
High
1pm 8
Very High
2pm 7.8
High
3pm 6.6
High
4pm 4.6
Moderate
5pm 2.9
Low
6pm 1.6
Low
7pm 0.6
Low
8pm 0.2
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Monday, July 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 0.1
Low
7am 0.4
Low
8am 1.2
Low
9am 2.6
Low
10am 4.4
Moderate
11am 6.2
High
12pm 7.6
High
1pm 8.3
Very High
2pm 7.9
High
3pm 6.7
High
4pm 5
Moderate
5pm 3.1
Moderate
6pm 1.6
Low
7pm 0.7
Low
8pm 0.2
Low
9pm 0
Low
10pm 0
Low
11pm 0
Low

The UV index forecast for Tuesday, July 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
5am 0
Low