Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
New Nor'easter brewing for East Coast. Click for the details. Chevron right
Trudy closes in on Mexico. See the track forecast. Chevron right

Mercer Island, WA

56°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Mercer Island

Washington

56°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
Create Your Account Unlock extended daily and hourly forecasts — all with your free account.
Let's Go Chevron right
Have an account already? Log In
settings
Help
Mercer Island, WA Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps
News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel
For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center
Today Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities
Sunday, October 18

Day

10/18
62°Hi
RealFeel® 63°
Pleasant
RealFeel Guide
Pleasant
63° to 81°
Most consider this temperature range ideal.
LEARN MORE
RealFeel Shade™ 59°
Cool
RealFeel Guide
Cool
53° to 62°
Light jacket or sweater may be appropriate.
LEARN MORE
Times of clouds and sun

Max UV Index3.0 (Moderate)

AccuLumen Brightness Index™8 (Bright)

WindN 7 mph

Wind Gusts17 mph

Probability of Precipitation1%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover46%

Morning

Afternoon

Night

10/18
46°Lo
RealFeel® 46°
Chilly
RealFeel Guide
Chilly
40° to 52°
Jacket or sweater is recommended.
LEARN MORE
Mostly cloudy

WindNNE 5 mph

Wind Gusts6 mph

Probability of Precipitation2%

Probability of Thunderstorms0%

Precipitation0.00 in

Cloud Cover91%

Evening

Overnight

Sun & Moon

10 hrs 43 mins
Rise 7:32 AM
Set 6:15 PM
First Quarter
Rise 3:15 PM
Set 11:55 PM

Temperature History

10/18
High
Low
Forecast
62°
46°
Average
60°
46°
Last Year
54°
45°
Record
71°
2023
32°
1949

Further Ahead

Hourly

10-Day

Monthly

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather Forecasts

Temperatures rebound across the Northeast after a frosty weekend

2 hours ago

Winter Weather

Winter forecast 2026-2027: El Niño to reshape snow, cold across US

1 day ago

Weather Forecasts

New nor'easter to howl along mid-Atlantic coast by next week

6 hours ago

Astronomy

A meteor shower linked to Halley’s Comet peaks Wednesday night

2 days ago

Hurricane

Trudy spreading wind, rain to Mexico as Simon struggles

2 hours ago

 More Stories

Featured Stories

Weather News

Dog rescued after 50 hours alone in Alaska wilderness

1 day ago

Weather News

Shrinking Lake Mead exposed a barrel; murder victim is now identified

1 day ago

Weather News

Cause of death revealed for Jackie, Big Bear's beloved bald eagle

1 day ago

Weather News

World’s largest wildlife crossing nears opening in California

2 days ago

Climate

AI-powered reefs may help beaches rebuild as erosion worsens

3 days ago
World North America United States Washington Mercer Island

Weather Near Mercer Island:

  • Bellevue, WA
  • Seattle, WA
  • Tacoma, WA
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2026 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information | Data Sources

...

...

...