Hourly Weather Forecast - Mercer Island, WA

12 AM
42°F
100%
3mph
S
Light Rain
Humidity
87%
Feels like
42°F
Dew Point
39°F
1 AM
43°F
90%
3mph
S
Light Rain
Humidity
85%
Feels like
41°F
Dew Point
38°F
2 AM
43°F
90%
3mph
S
Light Rain
Humidity
86%
Feels like
41°F
Dew Point
39°F
3 AM
42°F
90%
3mph
S
Light Rain
Humidity
84%
Feels like
41°F
Dew Point
38°F
4 AM
42°F
90%
4mph
S
Light Rain
Humidity
84%
Feels like
41°F
Dew Point
38°F
5 AM
42°F
90%
4mph
S
Light Rain
Humidity
85%
Feels like
41°F
Dew Point
38°F
6 AM
42°F
90%
4mph
S
Rain Showers
Humidity
85%
Feels like
40°F
Dew Point
38°F
7 AM
42°F
90%
4mph
S
Rain Showers
Humidity
85%
Feels like
40°F
Dew Point
38°F
7:54 AM
8 AM
43°F
80%
4mph
S
80% Chance Rain Showers
Humidity
83%
Feels like
41°F
Dew Point
38°F
9 AM
43°F
70%
4mph
S
70% Chance Rain Showers
Humidity
83%
Feels like
41°F
Dew Point
38°F
10 AM
44°F
70%
4mph
S
70% Chance of Light Rain
Humidity
81%
Feels like
42°F
Dew Point
39°F
11 AM
45°F
70%
4mph
S
70% Chance of Light Rain
Humidity
80%
Feels like
43°F
Dew Point
40°F
12 PM
46°F
70%
4mph
SSW
70% Chance of Light Rain
Humidity
80%
Feels like
44°F
Dew Point
40°F
1 PM
47°F
80%
4mph
SSW
80% Chance of Light Rain
Humidity
82%
Feels like
45°F
Dew Point
41°F
2 PM
46°F
90%
4mph
SSW
Light Rain
Humidity
82%
Feels like
45°F
Dew Point
41°F
3 PM
47°F
90%
4mph
S
Light Rain
Humidity
81%
Feels like
45°F
Dew Point
41°F
4 PM
46°F
90%
4mph
S
Light Rain
Humidity
79%
Feels like
44°F
Dew Point
40°F
4:20 PM
5 PM
46°F
90%
4mph
S
Light Rain
Humidity
80%
Feels like
44°F
Dew Point
40°F
6 PM
44°F
90%
4mph
S
Light Rain
Humidity
83%
Feels like
43°F
Dew Point
39°F
7 PM
44°F
90%
3mph
S
Light Rain
Humidity
84%
Feels like
42°F
Dew Point
39°F
8 PM
44°F
90%
3mph
S
Light Rain
Humidity
85%
Feels like
42°F
Dew Point
39°F
9 PM
43°F
90%
3mph
S
Light Rain
Humidity
84%
Feels like
42°F
Dew Point
39°F

Rainfall and Snowfall Totals Through Thursday

Pineapple Express Slams Northwestern U.S.

The atmospheric river this week will keep buffeting the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Today's Weather Outlook

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Weekly Drought Map for December 11, 2025

Hit-or-Miss Precipitation Leads to Mixed Drought Results

A person standing in a snowy forest with their back to the camera. They are bundled up in a white hat and a brown jacket. (Image by StockSnap from Pixabay)

Common Cold Weather Illnesses

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

Cold Air Damming - Cause And Effects

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