5-day weather forecast for Mercer Island, Washington

Weather changeability for Seattle, Washington

Temperature Last Month Last Year
Average change in high temperature day-to-day 3.0° 3.9°
Average change in low temperature day-to-day 5.3° 4.0°
Precipitation Last Month Last Year
Chance of dry day after a precip day 45% 50%
Chance of precip day after a dry day 36% 19%
 
 

Weather forecast accuracy for Seattle, Washington

Last Month (December)
The Weather Channel   81.72%
AccuWeather   81.45%
Weather Underground   80.65%
Foreca   80.11%
AerisWeather   77.15%
NWS Digital Forecast   76.08%
Wetter   72.31%
Open Weathermap   70.70%
World Weather Online   70.16%
Persistence   50.00%
Weather News   47.58%
Last Year (2020)
The Weather Channel   86.76%
Weather Underground   86.57%
AccuWeather   84.09%
Foreca   83.09%
NWS Digital Forecast   78.62%
AerisWeather   78.53%
Wetter   77.92%
Open Weathermap   74.19%
World Weather Online   70.44%
Persistence   54.87%
Weather News   52.99%
 

ForecastAdvisor Fact

On average, Persistence's high temperature forecasts for Seattle were off by 4.87 degrees last year.