14 days forecast Mercer Island
See the weather for the coming 14 days in Mercer Island.
Sunday, December 14 
5%
10° / 12°
3
5%Cloudy with some rain
Total precipitation 5.4 mm
Precipitation chance 90%
UV index 0
Monday, December 15 
10%
10° / 14°
4
10%Grey and some period of rain
Total precipitation 19.6 mm
Precipitation chance 100%
UV index 0
Tuesday, December 16 
0%
10° / 13°
4
0%Grey and heavy rainfall
Total precipitation 38.2 mm
Precipitation chance 100%
UV index 0
Wednesday, December 17 
30%
6° / 9°
4
30%Sun, but also an occasional shower
Total precipitation 8 mm
Precipitation chance 95%
UV index 0
Thursday, December 18 20%
7° / 8°
4
20%Grey and some period of rain
Total precipitation 15.2 mm
Precipitation chance 100%
UV index 0
Friday, December 19 
60%
5° / 8°
3
60%Sun and chance of a shower
Total precipitation 2 mm
Precipitation chance 65%
UV index 0
Saturday, December 20 15%
5° / 7°
3
15%Cloudy with some rain
Total precipitation 6.7 mm
Precipitation chance 90%
UV index 0
Sunday, December 21 20%
4° / 6°
2
20%Cloudy with some rain
Total precipitation 5.9 mm
Precipitation chance 90%
UV index 0
Monday, December 22 
45%
1° / 4°
3
45%Showers with rain and snow
Total precipitation 3.3 mm
Precipitation chance 80%
UV index 0
Tuesday, December 23 40%
0° / 4°
3
40%Showers with rain and snow
Total precipitation 6.4 mm
Precipitation chance 90%
UV index 0
Wednesday, December 24 35%
1° / 5°
2
35%Showers with rain and snow
Total precipitation 6.6 mm
Precipitation chance 90%
UV index 0
Thursday, December 25 45%
0° / 4°
2
45%Showers with rain and snow
Total precipitation 4.8 mm
Precipitation chance 85%
UV index 0
Friday, December 26 35%
0° / 4°
2
35%Showers with rain and snow
Total precipitation 6.1 mm
Precipitation chance 90%
UV index 0
Saturday, December 27 
30%
1° / 5°
2
30%Heavy showers possible
Total precipitation 10 mm
Precipitation chance 95%
UV index 0
Sunday, December 28 15%
2° / 7°
3
15%Cloudy with some rain
Total precipitation 9.4 mm
Precipitation chance 95%
UV index 0