Hourly Weather Forecast - Mercer Island, WA

12 AM
40°F
90%
3mph
S
Rain Showers
Humidity
83%
Feels like
38°F
Dew Point
36°F
1 AM
40°F
90%
3mph
S
Rain Showers
Humidity
82%
Feels like
38°F
Dew Point
35°F
2 AM
40°F
90%
3mph
S
Rain Showers
Humidity
83%
Feels like
38°F
Dew Point
35°F
3 AM
40°F
90%
4mph
SSW
Rain Showers
Humidity
82%
Feels like
38°F
Dew Point
35°F
4 AM
40°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
82%
Feels like
38°F
Dew Point
35°F
5 AM
40°F
90%
4mph
SSW
Rain Showers
Humidity
84%
Feels like
38°F
Dew Point
35°F
6 AM
40°F
90%
4mph
S
Rain Showers
Humidity
84%
Feels like
37°F
Dew Point
35°F
7 AM
40°F
90%
4mph
S
Rain Showers
Humidity
83%
Feels like
37°F
Dew Point
35°F
7:53 AM
8 AM
40°F
90%
4mph
S
Rain Showers
Humidity
82%
Feels like
38°F
Dew Point
35°F
9 AM
41°F
90%
4mph
S
Rain Showers
Humidity
82%
Feels like
38°F
Dew Point
36°F
10 AM
42°F
90%
4mph
S
Rain Showers
Humidity
81%
Feels like
39°F
Dew Point
36°F
11 AM
42°F
90%
4mph
SSW
Rain Showers
Humidity
80%
Feels like
41°F
Dew Point
37°F
12 PM
43°F
90%
4mph
SSW
Rain Showers
Humidity
81%
Feels like
41°F
Dew Point
38°F
1 PM
44°F
90%
4mph
SSW
Rain Showers
Humidity
82%
Feels like
42°F
Dew Point
38°F
2 PM
44°F
80%
4mph
SSW
80% Chance Rain Showers
Humidity
81%
Feels like
42°F
Dew Point
38°F
3 PM
43°F
70%
3mph
SSW
70% Chance of Light Rain
Humidity
82%
Feels like
42°F
Dew Point
38°F
4 PM
42°F
60%
3mph
S
60% Chance of Light Rain
Humidity
82%
Feels like
41°F
Dew Point
37°F
4:19 PM
5 PM
42°F
50%
3mph
S
50% Chance Rain Showers
Humidity
82%
Feels like
42°F
Dew Point
37°F
6 PM
42°F
40%
3mph
S
40% Chance Rain Showers
Humidity
83%
Feels like
42°F
Dew Point
37°F
7 PM
42°F
50%
3mph
S
50% Chance Rain Showers
Humidity
82%
Feels like
42°F
Dew Point
37°F
8 PM
42°F
60%
3mph
S
60% Chance Rain Showers
Humidity
84%
Feels like
42°F
Dew Point
37°F
9 PM
42°F
60%
3mph
S
60% Chance Rain Showers
Humidity
84%
Feels like
42°F
Dew Point
37°F
10 PM
41°F
50%
3mph
S
50% Chance of Light Rain
Humidity
84%
Feels like
41°F
Dew Point
37°F
11 PM
41°F
40%
2mph
SSE
40% Chance of Light Rain
Humidity
85%
Feels like
41°F
Dew Point
37°F

Rainfall and Snowfall Totals Through Wednesday

Heavy Rain, Snow, and Winds Wallop Northwest

The atmospheric river this week continues to hit the Pacific Northwest with heavy rain, snow, and high winds.

Wednesday's Weather Outlook

Wednesday's Weather Outlook

How to Measure Snow via NWS

How To Measure Snow

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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