5-day weather forecast for Sully, Iowa

Weather changeability for Marshalltown, Iowa

Temperature Last Month Last Year
Average change in high temperature day-to-day 6.7° 7.2°
Average change in low temperature day-to-day 8.9° 8.3°
Precipitation Last Month Last Year
Chance of dry day after a precip day 46% 59%
Chance of precip day after a dry day 33% 21%

Weather forecast accuracy for Marshalltown, Iowa

Last Month
MeteoGroup   74.17%
Weather Underground   73.25%
The Weather Channel   72.50%
NWS Digital Forecast   70.11%
Foreca   69.60%
AccuWeather   68.33%
Dark Sky (forecast.io)   66.11%
Persistence   31.93%
Last Year
Weather Underground   75.16%
The Weather Channel   74.91%
MeteoGroup   74.46%
Foreca   70.49%
WeatherBug   70.43%
AccuWeather   68.87%
NWS Digital Forecast   67.36%
CustomWeather   65.65%
Persistence   44.78%

ForecastAdvisor Fact

On average, Weather Underground's low temperature forecasts for Marshalltown were off by 2.99 degrees last year.