5-day weather forecast for Grafton, Illinois

Today




49°
62°
Rain Showers

Tomorrow




48°
66°
Rain Showers

Tuesday




48°
63°
Sunny
 
Click on a forecast to see the forecast trend for that day

Weather changeability for Grafton, Illinois

Temperature Last Month Last Year
Average change in high temperature day-to-day 10.6° 6.2°
Average change in low temperature day-to-day 12.5° 7.2°
Precipitation Last Month Last Year
Chance of dry day after a precip day 50% 63%
Chance of precip day after a dry day 13% 22%
 
 

Weather forecast accuracy for Grafton, Illinois

Last Month
MeteoGroup   66.67%
The Weather Channel   66.05%
Weather Underground   65.38%
Foreca   64.56%
Dark Sky (forecast.io)   61.73%
NWS Digital Forecast   61.07%
AccuWeather   60.19%
World Weather Online   58.95%
Persistence   47.32%
Last Year
The Weather Channel   78.50%
Weather Underground   77.91%
MeteoGroup   77.24%
Foreca   76.24%
AccuWeather   74.97%
Dark Sky (forecast.io)   70.37%
NWS Digital Forecast   68.79%
World Weather Online   66.00%
Persistence   44.89%
 

ForecastAdvisor Fact

50.6% of MeteoGroup's high temperature forecasts for Grafton were within 3 degrees of actual temperatures last month.