Granite City weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around Granite City and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitGranite City, IL is at its warmest in Jul (average highs near 88°F) and coldest in Jan (lows around 27°F), with roughly 45 in of precipitation across the year. Below, compare what NWS, American, European forecast for Granite City right now, and see exactly where they disagree.
Granite City climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in the US?
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 40 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.
Common questions
What's the weather in Granite City today?
Will it rain in Granite City today or tomorrow?
Which forecast is most accurate for Granite City?
What is the warmest month in Granite City?
How cold does Granite City get?
How much rain does Granite City get?
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.