NimbocastMercer Island, WA Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for Mercer Island, King County, Washington.
Updated Jul 29, 2026, 12:19 PM local time · Radar refreshes every 5 minutes
🌤️
Mercer Island
70°F
Wind 5 mph
Humidity 57%
Cloud cover 42%
UV index 7
Alerts 0
Active alerts
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No active National Weather Service alerts for Mercer Island, WA.
Mercer Island weather radar
Light
Heavy
Next 24 hours
Now
🌤️
69°F
1 PM
☁️
71°F
2 PM
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72°F
3 PM
☁️
73°F
4 PM
☁️
74°F
5 PM
☀️
74°F
6 PM
☀️
74°F
7 PM
☀️
73°F
8 PM
☀️
69°F
9 PM
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65°F
10 PM
☀️
63°F
11 PM
☀️
60°F
12 AM
🌤️
59°F
1 AM
☀️
57°F
2 AM
⛅
56°F
3 AM
☀️
55°F
4 AM
☀️
54°F
5 AM
☀️
52°F
6 AM
☀️
51°F
7 AM
☀️
55°F
8 AM
☀️
58°F
9 AM
☀️
60°F
10 AM
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63°F
11 AM
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66°F
7-day forecast
Today
Jul 29
☁️
74°F
55°F
1%
Thu
Jul 30
☁️
76°F
51°F
2%
Fri
Jul 31
☀️
85°F
55°F
Sat
Aug 1
☁️
76°F
59°F
23%
Sun
Aug 2
☁️
73°F
57°F
15%
Mon
Aug 3
☁️
76°F
51°F
Tue
Aug 4
☀️
82°F
54°F
Weather near Mercer Island
3 mi
Bellevue, WA3 mi
Columbia City, WA5 mi
Bryn Mawr-Skyway, WA6 mi
Seattle, WA6 mi
Renton, WA6 mi
West Lake Sammamish, WA7 mi
Tukwila, WA8 mi
Kirkland, WA
Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.