Mercer Island, WA Weather Forecast and Current Conditions

WEATHER ALERTS - Flood Watch - Special Weather Statement - Wind Advisory

Current Conditions From Nearby Local Station

Cloudy 49°F
Feels Like 49°F  
Humidity 93% Dew Point 47°F Wind W 1 MPH Gusts 3 Barometer 30.06 in.
Report from a personal weather station 0.9 mi. NNE of central Mercer Island
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Point Forecast at a Glance

MonDec 15
Mon Dec 15: Rain, Low 47F
80%
 
47
TueDec 16
Tue Dec 16: Rain, High 55F, Low 43F
100%
55
43
WedDec 17
Wed Dec 17: Rain, High 48F, Low 42F
90%
48
42
ThuDec 18
Thu Dec 18: Rain, High 50F, Low 40F
100%
50
40
FriDec 19
Fri Dec 19: Rain, High 46F, Low 39F
50%
46
39
SatDec 20
Sat Dec 20: Rain, High 45F, Low 39F
50%
45
39
SunDec 21
Sun Dec 21: Snow, High 46F, Low 38F
50%
46
38

Jump to detailed forecast ↓

7-Day Temperature Trend

Week Ahead Summary

High temperatures remain relatively stable through the week, ranging from 45°F to 55°F. Unsettled weather expected with rain on most days, including one day with snow.

Climate Context

This week's forecast shows temperatures running 3°F above the historical average for December. Normal highs for this period are around 45°F with lows around 35°F.

This Date in Weather History

1917 - An ice jam closed the Ohio River between Warsaw, KY, and Rising Sun, IN. The thirty foot high ice jam held for 58 days, and backed up the river a distance of 100 miles.

More on this and other weather history

Mercer Island, WA 7 Day Weather Forecast Details

Monday Dec 15

Rain

Night: Rain. Low around 47. South wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Tuesday Dec 16

Rain

Day: Rain. High near 55. South southwest wind 9 to 16 mph, with gusts as high as 30 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Rain

Night: Rain. Low around 43. Southwest wind 17 to 20 mph, with gusts as high as 34 mph. Chance of precipitation is 100%. New precipitation amounts between a half and three quarters of an inch possible.

Wednesday Dec 17

Rain

Day: Rain. High near 48. South southwest wind 10 to 15 mph, with gusts as high as 24 mph. Chance of precipitation is 90%. New precipitation amounts of less than a tenth of an inch possible.

Rain

Night: Rain. Low around 42. South wind around 9 mph. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Thursday Dec 18

Rain

Day: Rain. High near 50. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Rain

Night: Rain. Low around 40. Chance of precipitation is 90%.

Friday Dec 19

Rain

Day: Rain. Mostly cloudy, with a high near 46.

Rain

Night: Rain. Mostly cloudy, with a low around 39.

Saturday Dec 20

Rain

Day: Rain. Mostly cloudy, with a high near 45.

Snow

Night: Rain likely, possibly mixed with snow. Mostly cloudy, with a low around 39.

Sunday Dec 21

Snow

Day: Rain likely, possibly mixed with snow. Mostly cloudy, with a high near 46.

Snow

Night: Rain likely, possibly mixed with snow. Mostly cloudy, with a low around 38.

Monday Dec 22

Snow

Day: Rain likely, possibly mixed with snow. Mostly cloudy, with a high near 46.


About Mercer Island, WA

Mercer Island is a city in King County, Washington, United States, located on an island of the same name in the southern portion of Lake Washington. Mercer Island is in the Seattle metropolitan area, connected to the mainland on both sides by bridges carrying Interstate 90, with the city of Seattle to the west and the city of Bellevue to the east. The Lacey V. Murrow Memorial Bridge and the parallel Homer M. Hadley Memorial Bridge are floating bridges that span Lake Washington and carry, respectively, eastbound and westbound lanes of Interstate 90 and connect Mercer Island to the northern portion of Seattle's South End. I-90 traverses the northern portion of Mercer Island and is then carried from the island to Bellevue over the East Channel of Lake Washington by the East Channel Bridge. Mercer Island is located closer to Bellevue than it is to Seattle, and is therefore often considered to be part of King County's Eastside. The population was 25,748 at the 2020 census. Mercer Island is one of the 100 richest ZIP codes in the US according to the IRS figures for Adjusted Gross Income.

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