Hourly Weather Forecast - Mercer Island, WA

12 AM
49°F
90%
4mph
SSW
Rain Showers
Humidity
89%
Feels like
47°F
Dew Point
46°F
1 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
89%
Feels like
47°F
Dew Point
46°F
2 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
90%
Feels like
47°F
Dew Point
46°F
3 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
90%
Feels like
47°F
Dew Point
46°F
4 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
90%
Feels like
47°F
Dew Point
46°F
5 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
90%
Feels like
47°F
Dew Point
46°F
6 AM
49°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
90%
Feels like
47°F
Dew Point
46°F
7 AM
49°F
70%
4mph
SSW
70% Chance of Light Rain
Humidity
90%
Feels like
47°F
Dew Point
46°F
7:50 AM
8 AM
49°F
70%
4mph
SSW
70% Chance of Light Rain
Humidity
89%
Feels like
48°F
Dew Point
46°F
9 AM
50°F
80%
5mph
SSW
80% Chance of Light Rain
Humidity
86%
Feels like
50°F
Dew Point
46°F
10 AM
51°F
80%
5mph
SSW
80% Chance Rain Showers
Humidity
85%
Feels like
51°F
Dew Point
47°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