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 2.1° 3.9°
Average change in low temperature day-to-day 4.4° 3.9°
Precipitation Last Month Last Year
Chance of dry day after a precip day 25% 29%
Chance of precip day after a dry day 71% 24%

Weather forecast accuracy for Seattle, Washington

Last Month
AccuWeather   87.36%
Foreca   83.62%
The Weather Channel   82.76%
Weather Underground   82.76%
NWS Digital Forecast   82.47%
MeteoGroup   80.75%
Dark Sky (forecast.io)   79.02%
World Weather Online   67.82%
Persistence   56.48%
Last Year
The Weather Channel   83.49%
Weather Underground   82.88%
AccuWeather   81.46%
Foreca   79.70%
Dark Sky (forecast.io)   78.15%
MeteoGroup   78.12%
NWS Digital Forecast   75.66%
World Weather Online   66.96%
Persistence   57.23%

ForecastAdvisor Fact

On average, NWS Digital Forecast's low temperature forecasts for Seattle were off by 2.31 degrees last month.