Sioux City weather
Loading live data…Light drizzle,thunder likely tomorrow
NWS, the American and the European model put Sioux City's high today between 87° and 91°, a 5° split. Tomorrow looks thunderstorm around 88°, with a 28% chance of rain.
The weather map: all three models at once
NWS, American, European side by side around Sioux City and nearby towns.Live rain radar →Next 14 hours
consensus of the three models14-day forecast
where the models agree, and where they splitSioux City, IA is at its warmest in Jul (average highs near 84°F) and coldest in Jan (lows around 12°F), with roughly 31 in of precipitation across the year. Below, compare what NWS, American, European forecast for Sioux City right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
Sioux City climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in Sioux City?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.
Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain — and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.