Hourly Weather Forecast - Mercer Island, WA

12 AM
51°F
80%
3mph
SSE
80% Chance of Light Rain
Humidity
89%
Feels like
51°F
Dew Point
47°F
1 AM
51°F
80%
3mph
SSE
80% Chance of Light Rain
Humidity
89%
Feels like
51°F
Dew Point
48°F
2 AM
51°F
80%
3mph
SSE
80% Chance of Light Rain
Humidity
90%
Feels like
51°F
Dew Point
48°F
3 AM
51°F
80%
4mph
SSE
80% Chance of Rain
Humidity
89%
Feels like
51°F
Dew Point
48°F
4 AM
52°F
80%
4mph
S
80% Chance of Light Rain
Humidity
88%
Feels like
52°F
Dew Point
48°F
5 AM
52°F
80%
4mph
S
80% Chance of Light Rain
Humidity
89%
Feels like
52°F
Dew Point
49°F
6 AM
53°F
80%
4mph
S
80% Chance of Light Rain
Humidity
88%
Feels like
53°F
Dew Point
49°F
7 AM
53°F
80%
4mph
S
80% Chance of Light Rain
Humidity
87%
Feels like
53°F
Dew Point
50°F
7:50 AM
8 AM
54°F
80%
4mph
S
80% Chance of Rain
Humidity
87%
Feels like
54°F
Dew Point
50°F
9 AM
55°F
80%
4mph
S
80% Chance of Rain
Humidity
87%
Feels like
55°F
Dew Point
51°F
10 AM
56°F
80%
4mph
S
80% Chance of Rain
Humidity
87%
Feels like
56°F
Dew Point
52°F
11 AM
56°F
80%
5mph
S
80% Chance of Rain
Humidity
88%
Feels like
56°F
Dew Point
53°F
12 PM
57°F
90%
5mph
S
Rain
Humidity
90%
Feels like
57°F
Dew Point
54°F
1 PM
56°F
90%
5mph
SSW
Rain
Humidity
90%
Feels like
56°F
Dew Point
54°F
2 PM
56°F
90%
5mph
SSW
Rain
Humidity
90%
Feels like
56°F
Dew Point
53°F
3 PM
55°F
90%
5mph
SSW
Rain
Humidity
89%
Feels like
55°F
Dew Point
52°F
4 PM
54°F
90%
5mph
SSW
Light Rain
Humidity
87%
Feels like
54°F
Dew Point
50°F
4:17 PM
5 PM
52°F
90%
5mph
SSW
Light Rain
Humidity
91%
Feels like
52°F
Dew Point
50°F
6 PM
52°F
90%
5mph
SSW
Rain Showers
Humidity
92%
Feels like
52°F
Dew Point
49°F
7 PM
51°F
100%
4mph
SSW
Rain Showers
Humidity
91%
Feels like
51°F
Dew Point
48°F
8 PM
51°F
100%
4mph
SSW
Rain Showers
Humidity
89%
Feels like
51°F
Dew Point
47°F
9 PM
50°F
100%
4mph
SSW
Rain Showers
Humidity
87%
Feels like
50°F
Dew Point
46°F
10 PM
50°F
90%
4mph
SSW
Rain Showers
Humidity
86%
Feels like
48°F
Dew Point
46°F
11 PM
49°F
90%
4mph
SSW
Rain Showers
Humidity
86%
Feels like
48°F
Dew Point
46°F

Snow and ice forecast through Friday A.M.

Multiple Snow Threats Across the Northern U.S.

Multiple systems will bring snow across the Northern U.S. through the end of the week.

Rainfall Forecast for Northwest through Friday A.M.

Unrelenting Rains Soak the Northwest

Thursday's Weather Outlook

Thursday's Weather Outlook

Weekly Drought Map for December 4, 2025

Active Week of Weather Leads to Mixed Drought Results

A strong cold-air-damming event from March 20, 2018.

Cold Air Damming - Cause And Effects

People skating on a frozen pond on a clear day. (Image by Q K from Pixabay)

Safety Tips For Icy Surfaces

Today's National Outlook

Hurricane Tracker

Allergy Forecast

Snow & Ski Forecast

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Outdoor Sports Guide