14 days forecast Mercer Island
See the weather for the coming 14 days in Mercer Island.
Tuesday, September 17 
10%
11° / 15°
3
10%Cloudy with some rain
Total precipitation 3.1 mm
Precipitation chance 80%
UV index 0
Wednesday, September 18 
35%
13° / 19°
3
35%Regular sun, also clouds
Total precipitation 0.1 mm
Precipitation chance 5%
UV index 4
Thursday, September 19 
65%
12° / 20°
3
65%Lots of sun, few clouds
Total precipitation 0.1 mm
Precipitation chance 5%
UV index 3
Friday, September 20 50%
12° / 18°
3
50%Regular sun, also clouds
Total precipitation 0.1 mm
Precipitation chance 5%
UV index 2
Saturday, September 21 
65%
11° / 18°
3
65%Lots of sun, also cirrus clouds
Total precipitation 0.6 mm
Precipitation chance 20%
UV index 3
Sunday, September 22 
70%
12° / 20°
3
70%Sun and chance of a shower
Total precipitation 1.3 mm
Precipitation chance 45%
UV index 3
Monday, September 23 55%
13° / 19°
3
55%Sun and chance of a shower
Total precipitation 2.5 mm
Precipitation chance 75%
UV index 2
Tuesday, September 24 
60%
14° / 19°
3
60%Sun, but also an occasional shower
Total precipitation 4.3 mm
Precipitation chance 85%
UV index 2
Wednesday, September 25 50%
12° / 18°
3
50%Sun and chance of a shower
Total precipitation 2.6 mm
Precipitation chance 75%
UV index 2
Thursday, September 26 75%
11° / 18°
3
75%Lots of sun, few clouds
Total precipitation 0.9 mm
Precipitation chance 30%
UV index 3
Friday, September 27 85%
11° / 18°
3
85%Lots of sun, few clouds
Total precipitation 0.3 mm
Precipitation chance 10%
UV index 3
Saturday, September 28 75%
11° / 19°
2
75%Lots of sun, also cirrus clouds
Total precipitation 0.7 mm
Precipitation chance 20%
UV index 3
Sunday, September 29 65%
12° / 18°
2
65%Lots of sun, also cirrus clouds
Total precipitation 0.8 mm
Precipitation chance 25%
UV index 2
Monday, September 30 70%
12° / 18°
3
70%Sun and chance of a shower
Total precipitation 1.4 mm
Precipitation chance 45%
UV index 2