What is today's weather forecast for Mercer Island, WA?

Today's forecast for Mercer Island shows a high of 46 degrees Fahrenheit. Rain.

What is the 7-day weather forecast for Mercer Island, WA?

The 7-day forecast for Mercer Island shows highs from 46 to 51 degrees and lows from 37 to 46 degrees Fahrenheit. Expect precipitation on 8 days with chances of 20% or higher.

Will it rain in Mercer Island, WA this week?

Yes, rain is possible in Mercer Island this week. Precipitation chances: Tuesday (100% chance), Wednesday (90% chance), Thursday (100% chance), Friday (50% chance), Saturday (50% chance), Sunday (50% chance), Monday (50% chance), Tuesday (50% chance).

How accurate is the Mercer Island weather forecast?

WeatherForYou provides highly accurate Mercer Island forecasts using National Weather Service data and current conditions from the nearest available weather stations, often miles closer than regional airports, for the most precise local forecasts.

Mercer Island, WA Weather Forecast and Current Conditions

Current Conditions From Nearby Local Station

Switch to Metric Units

44°F
Feels Like 44°F

Humidity 94% Dew Point 42°F Wind Calm Barometer 30.19 in.

Solar Rad 42 w/m²

Report from a personal weather station 0.9 mi. NNE of central Mercer Island
at 2:48 PM Tue, Nov 25, 2025

Point Forecast at a Glance

TueNov 25

90%

WedNov 26

30%

ThuNov 27

100%

FriNov 28

30%

SatNov 29

50%

SunNov 30

MonDec 1

50%

7-Day Temperature Trend

Week Ahead Summary

High temperatures remain relatively stable through the week, ranging from 46°F to 51°F. Unsettled weather expected with wintry mix likely on at least 7 days.

Climate Context

This week's forecast shows temperatures running 1°F above the historical average for November-December. Normal highs for this period are around 48°F with lows around 36°F.

This Date in Weather History

1983 - The Great Thanksgiving Weekend Blizzard hit Denver, CO. The storm produced 21.5 inches of snow in 37 hours, closing Stapleton Airport for 24 hours. The snow and wind closed interstate highways around Denver. Visibility at Limon CO was down to zero for 24 hours.

Mercer Island, WA 7 Day Weather Forecast Details

Tuesday Nov 25

Day: Rain. High near 46. East southeast wind around 5 mph. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Night: Rain before 1am, then a chance of rain after 4am. Temperature rising to around 47 by 5am. South wind around 5 mph. Chance of precipitation is 100%. New precipitation amounts between a tenth and quarter of an inch possible.

Wednesday Nov 26

Day: A slight chance of rain before 10am, then a chance of rain after 2pm. Cloudy, with a high near 51. Calm wind. Chance of precipitation is 30%.

Night: Rain, mainly after 10pm. Low around 46. Light northeast wind. Chance of precipitation is 90%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Nov 27

Day: Rain. High near 50. East southeast wind around 6 mph becoming northeast in the afternoon. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Night: Rain, mainly before 10pm. Low around 43. Chance of precipitation is 80%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Nov 28

Day: A 30 percent chance of rain before 10am. Partly sunny, with a high near 51.

Night: A slight chance of rain after 10pm. Mostly cloudy, with a low around 40.

Saturday Nov 29

Day: A slight chance of rain before 10am. Mostly cloudy, with a high near 49.

Night: Mostly cloudy, with a low around 37.

Sunday Nov 30

Day: Partly sunny, with a high near 48.

Night: A slight chance of rain and snow. Mostly cloudy, with a low around 39.

Monday Dec 1

Day: A chance of rain and snow. Mostly cloudy, with a high near 49.

Night: A chance of rain. Mostly cloudy, with a low around 42.

Tuesday Dec 2

Day: A chance of rain. Mostly cloudy, with a high near 50.

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.

Content from Wikipedia, licensed under CC BY-SA 3.0.

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