Mercer Island Hourly Weather Forecast
Next 48 Hours
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Starting off Overcast conditions, turning patchy rain nearby later in the day. Warming trend from 52°F to 72°. Light winds, shifting from NNE to NNE at 3.7 mph, with humidity ranging 40% to 87%, and an avg barometric pressure of 30.02 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
3 AM
54°F
52°F
78%
2.7 NNE
30.01
47°F
0
85%
Rain est. 0.35in
Rain est. 0.35in
4 AM
53°F
51°F
78%
2.2 NE
30.02
47°F
0
86%
Rain est. 0.35in
Rain est. 0.35in
5 AM
53°F
51°F
79%
1.6 ENE
30.03
47°F
0
78%
Rain est. 0.35in
Rain est. 0.35in
6 AM
52°F
50°F
81%
1.8 ENE
30.04
47°F
0
87%
Rain est. 0.35in
Rain est. 0.35in
7 AM
52°F
50°F
84%
1.8 ENE
30.05
47°F
0
88%
Rain est. 0.35in
Rain est. 0.35in
8 AM
54°F
54°F
87%
1.1 ENE
30.06
51°F
0.3
85%
Rain est. 0.35in
Rain est. 0.35in
9 AM
58°F
58°F
81%
0.7 ENE
30.05
52°F
1
85%
Rain est. 0.35in
Rain est. 0.35in
10 AM
60°F
59°F
67%
2.5 NNW
30.05
49°F
2
17%
11 AM
63°F
60°F
61%
4.5 NNW
30.04
49°F
3.1
15%
12 PM
66°F
63°F
55%
4.7 NNW
30.03
49°F
4.1
13%
1 PM
69°F
66°F
48%
4.7 NNW
30.01
48°F
4.5
11%
2 PM
71°F
67°F
44%
5.6 NNW
30
48°F
4.3
10%
3 PM
71°F
67°F
42%
6.3 NW
29.99
47°F
3.4
5%
4 PM
72°F
67°F
40%
6.7 NW
29.99
46°F
2.1
3%
5 PM
71°F
67°F
40%
6.3 NW
29.99
46°F
0.8
1%
6 PM
69°F
65°F
43%
6 NNW
30
46°F
0.1
1%
7 PM
65°F
62°F
56%
4.9 NNE
30.02
49°F
0
6%
8 PM
61°F
59°F
65%
3.8 NE
30.02
49°F
0
11%
9 PM
60°F
59°F
68%
3.1 NE
30.03
50°F
0
16%
10 PM
59°F
57°F
72%
3.1 NNE
30.04
50°F
0
22%
11 PM
58°F
55°F
74%
3.6 NNE
30.03
49°F
0
23%
Sun, Sep 6th 2026
Sunny skies giving way to Clear conditions by evening. Warming trend from 52°F to 74°. Light winds, shifting from NNE to NNE at 5 mph, as humidity ranges 38% to 86%, and an avg barometric pressure of 29.98 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
12 AM
57°F
55°F
76%
3.6 NNE
30.03
49°F
0
17%
1 AM
56°F
54°F
78%
3.8 NNE
30.02
49°F
0
20%
2 AM
55°F
53°F
80%
4 NNE
30.02
49°F
0
10%
3 AM
54°F
52°F
82%
4 NNE
30.01
49°F
0
10%
4 AM
53°F
52°F
84%
3.8 NNE
30.01
48°F
0
12%
5 AM
52°F
50°F
85%
2.9 NNE
30.01
48°F
0
12%
6 AM
52°F
51°F
86%
3.4 NNE
30.01
48°F
0
12%
7 AM
52°F
51°F
86%
3.1 NNE
30.02
48°F
0
12%
8 AM
55°F
53°F
80%
3.8 NNE
30.02
49°F
0.3
10%
9 AM
58°F
55°F
72%
5.8 NNE
30.03
49°F
1
7%
10 AM
62°F
59°F
63%
6.3 NNE
30.02
49°F
2
4%
11 AM
67°F
64°F
52%
5.6 NNE
30
49°F
3.1
2%
12 PM
70°F
67°F
45%
6 N
29.98
48°F
4.1
4%
1 PM
73°F
68°F
42%
6.5 NNW
29.96
48°F
4.5
8%
2 PM
74°F
69°F
40%
7.4 NNW
29.95
48°F
4.3
1%
3 PM
74°F
68°F
39%
9.6 NNW
29.94
48°F
3.5
1%
4 PM
73°F
67°F
39%
9.2 NNW
29.93
47°F
2.3
3%
5 PM
72°F
67°F
38%
7.8 NNW
29.92
45°F
1.2
3%
6 PM
71°F
66°F
40%
6.3 NNW
29.93
45°F
0.5
1%
7 PM
68°F
64°F
47%
4.5 N
29.94
47°F
0.1
2%
8 PM
63°F
61°F
55%
3.8 N
29.95
47°F
0
3%
9 PM
62°F
59°F
60%
3.4 NNE
29.97
48°F
0
4%
10 PM
60°F
58°F
65%
3.1 NNE
29.98
48°F
0
5%
11 PM
59°F
57°F
68%
3.1 NNE
29.98
48°F
0
5%
Mon, Sep 7th 2026
Clear conditions expected later. Temps range from 56° to 58°. Calm winds, shifting from ENE to SSE at 2.6 mph, with humidity ranging 70% to 73%, and an avg barometric pressure of 29.99 inHg.
Temp
Feel
Humidity
Wind
Pressure
Dew Point
UV
Precip.
12 AM
58°F
56°F
70%
2.9 ENE
29.99
48°F
0
6%
1 AM
57°F
55°F
72%
2.2 ESE
29.99
48°F
0
7%
2 AM
56°F
54°F
73%
2.7 SSE
30
48°F
0
7%
This hour by hour weather report is valid for ZIP code 98040, accurately covering the area of Mercer Island, WA.
Currently
|
55°F |
30 inHg.
Barometer 88%
Humidity NNE 2.7mph Wind |
| Patchy rain nearby | ||
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